February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
PROGRAM & ABSTRACT
The 3rd GCOE International Symposium "Weaving Science Web beyond Particle-Matter Hierarchy"
- Partially supported by ERATO-JST February 17 (Thu) - February 19 (Sat.), 2011 Main Lecture Hall, Faculty of Science Aobayama Campus of Tohoku University, Sendai, Japan
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Contents
Organizing committee ...... 3
GCOE program members ...... 4
Symposium Location...... 6
Scientific Program ...... 7
Time Table ...... 9
Speakers/Titles ...... 12
Talks ...... 17
Poster presentations...... 22
Abstracts of Talks ...... 28
Abstracts of Poster Presentations ...... 57
2 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Organizing committee
*(Chairman) Yoshiro Hirayama, **(Program Leader) Kunio Inoue
Organizing Committee (Extended steering committee of GCOE program): Toshifumi Futamase (Astrophysics Tohoku Univ.) Osamu Hashimoto (Nuclear Physics, Tohoku Univ.) Ken-ichi Hikasa (Particle Physics, Tohoku Univ.) Yoshiro Hirayama (Condensed Matter Physics, Tohoku Univ.)* Kunio Inoue (Particle Physics, Tohoku Univ.)** Motoko Kotani (Mathematics, Tohoku Univ.) Hideo Kozono (Mathematics, Tohoku Univ.) Yoshio Kuramoto (Condensed Matter Physics, Tohoku Univ.) Kiyotaka Naoe (Philosophy, Tohoku Univ.) Takashi Takahasi (Condenced Matter Physics, Tohoku Univ.) Hirokazu Tamura (Nuclear Physics, Tohoku Univ.) Masahiro Yamaguchi (Particle Physics, Tohoku Univ.)
Local Committee: Yoshiro Hirayama (Condensed Matter Physics, Tohoku Univ.) * Masaki Asano (Particle Physics, Tohoku Univ.) Takeshi Koike (Nuclear Physics, Tohoku Univ.) Syunpei Masuda (Condensed Matter Physics, Tohoku Univ.) Yohei Matsuda (Nuclear Physics, Tohoku Univ.) Hidekatsu Nemura (Nuclear Physics, Tohoku Univ.) Yoshiyuki Onuki (Particle Physics, Tohoku Univ.) Katsuhiko Sato (Condensed Matter Physics, Tohoku Univ.) Hiroshi Takeda (Mathematics, Tohoku Univ.) Mamoru Tanaka (Mathematics, Tohoku Univ.) Mikito Tanaka (Astrophysics, Tohoku Univ.) Yoshihiro Ueda (Mathematics, Tohoku Univ.) Masaru Yonehara (Philosophy, Tohoku Univ.) Tatsuro Yuge (Condensed Matter Physics, Tohoku Univ.)
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GCOE program members
Name Affiliated Department, Position Title/Specialized field
Representative
Akihisa Inoue President of Tohoku University
Program Leader
Kunio Inoue Research Center for Neutrino Science, Professor/Neutrino Experiment
Program Members
Ken-ichi Hikasa Graduate School of Science, Professor/Particle Theory
Osamu Hashimoto Graduate School of Science, Professor/Nuclear Experiment
Yoshio Kuramoto Graduate School of Science, Professor/Condensed Matter Theory
Yoshiro Hirayama Graduate School of Science, Professor/Quantum Semiconductor Physics
Hirokazu Tamura Graduate School of Science, Professor/Nuclear Experiment
Masahiro Yamaguchi Graduate School of Science, Professor/Particle Theory
Riichiro Saito Graduate School of Science, Professor/Condensed Matter Theory
Hitoshi Yamamoto Graduate School of Science, Professor/Particle Experiment
Toshihiro Kawakatsu Graduate School of Science, Professor/Condensed Matter Theory
Teruya Ishihara Graduate School of Science, Professor/Solid state Photo physics
Toshio Kobayashi Graduate School of Science, Professor/Nuclear Experiment
Hajime Shimizu Research Center for Electron Photon Science, Professor/Nuclear Experiment
4 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Yasuhiro Sakemi Cyclotron and Radioisotope Center, Professor/Nuclear Experiment
Taka-hisa Arima Institute of Multidisciplinary Research for Advanced Materials, Professor/Correlated-electron Solid State Physics
Kazuyoshi Yamada WPI and Department of Physics, Professor/Condensed Spin Matter Physics
Takashi Takahashi WPI and Department of Physics, Professor/Photoemission Solid-State Physics
Katsumi Tanigaki WPI and Department of Physics, Professor/Solid State Physics on Nano-Network Solids
Hideo Kozono Graduate School of Science, Professor/Mathematical Physics
Motoko Kotani Graduate School of Science, Professor/Differential Geometry
Reiko Miyaoka Graduate School of Science, Professor/Differential Geometry
Takashi Shioya Graduate School of Science, Professor/Riemannian Geometry
Takayoshi Ogawa Graduate School of Science, Professor/Partial Differential Equations
Kazuhiro Ishige Graduate School of Science, Professor/Partial Differential Equations
Toshifumi Futamase Graduate School of Science, Professor/Cosmology and General Relativity
Takashi Ichikawa Graduate School of Science, Professor/Extragalactic Astronomy
Toru Yamada Graduate School of Science, Professor/Extragalactic Astronomy
Makoto Hattori Graduate School of Science, Associate Professor/Observational Cosmology
Keiichi Noe Graduate School of Arts and Letters, Professor/Science Philosophy
Kiyotaka Naoe Graduate School of Arts and Letters, Associate Professor/Ethics of Science and Technology
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Symposium Location Aobayama Campus of Faculty of Science, Tohoku University
Registration: Main Lecture Hall (Feb.17-19, 8:30-12:30) ―Sogotoh‖ Bldg. 2F(Feb.7-18, 13:30-17:30)
Plenary Session: Main Lecture Hall (Feb.17-19, 9:00-13:00)
Parallel Sessions: Rooms, 203, 204, and 303, ―Sogotoh‖ Bldg. (Feb.17, 14:00-17:00; Feb.18, 16:00-18:00) Interdisciplinary Research Session: Room 203, ―Sogotoh‖ Bldg. (Feb.18, 14:00-16:00) Poster Session: Entrance Hall (2F) & Room 205, ―Sogotoh‖ Bldg. (Feb.17, 17:00-18:00; Feb.18, 18:00-19:00) Banquet: Cafeteria (Feb. 17, 18:00-20:00)
6 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Scientific Program http://www.scienceweb.tohoku.ac.jp/special/gcoeis2011/
Invited speakers Plenary session: Prof. Shunqing Shen (Condensed Matter Physics, University of Hong Kong, Hong Kong) Prof. Chong-Yun Park (Condensed Matter Physics, Sungkyunkwan University, Korea) Prof. Zuo-nong Zhu (Mathematics, Shanghai Jiao Tong University (SJTU), China) Associate Prof. Kai-Feng Chen (Particle Physics, National Taiwan University, Taiwan) Prof. Hi Jun Choe (Mathematics, Yonsei University, Korea) Prof. Hyunseok Kim (Mathematics, Sogang University, Korea) Associate Prof. Myungshin Im (Astrophysics, Seoul National University, Korea) Prof. Kiwoon Choi (Particle Physics, Korea Advanced Institute of Science and Technology (KAIAT), Korea) Associate Prof. Kiyoshi Tanida (Nuclear Physics, Seoul National University, Korea) Prof. Di-Jing Huang (Condensed Matter Physics, National Tsing Hua University, Taiwan) Dr. Qiong He (Condensed Matter Physics, Fudan University, China) Prof. Zhanghai Chen (Condensed Matter Physics, Fudan University, China) Prof. Edward Y. Chang (Condensed Matter Physics, National Chio Tung University (NCTU), Taiwan) Prof. Bingbing Liu (Condensed Matter Physics, Jilin University, China) Prof. Tain Cui (Condensed Matter Physics, Jilin University, China) Prof. Jeu-Jeng Yuann (Philosophy, National Taiwan University, Taiwan) Prof. Steve S. Chung (Condensed Matter Physics, National Chio Tung University (NCTU), Taiwan) Prof. Wu-Ching Chou (Condensed Matter Physics, National Chio Tung University (NCTU), Taiwan) Prof. Wen-Hao Chang (Condensed Matter Physics, National Chio Tung University (NCTU), Taiwan) Associate Prof. Hyun-Woo Lee (Condensed Matter Physics, Pohang University of Scie. and Tech., Korea) Dr. Pei-Tzu Yu (National Chiao Tung University (NCTU), Taiwan)
Parallel session: Dr. Haizhou Lu (Condensed Matter Physics, University of Hong Kong, Hong Kong) Mr. Hai-qiong Zhao (Mathematics, Shanghai Jiao Tong University (SJTU), China) Mr. Tong Zhou (Mathematics, Shanghai Jiao Tong University (SJTU), China) Mr. Hyunsung Jun (Astrophysics, Seoul National University, Korea) Mr. Changsu Choi (Astrophysics, Seoul National University, Korea) Mr. Danny Haberer (Institute for Solid State Research Lab., Leibniz IFW, Dresden, Germany) Mr. Kun Ding (Condensed Matter Physics, Fudan University, China) Mr. Hongxing Dong (Condensed Matter Physics, Fudan University, China)
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Mr. Saifeng Zhang (Condensed Matter Physics, Fudan University, China) Mr. Jing Fan (Condensed Matter Physics, Jilin University, China) Assistant Prof. Wing-Keung Lam (Philosophy, Hong Kong Institute of Education (HKIEd), Hong Kong) Dr. Ching-yuen Cheung (Philosophy, Chinese University of Hong Kong, Hong Kong) Mr. Chia-Hsien Lin (Condensed Matter Physics, National Chio Tung University (NCTU), Taiwan) Mr. Yu-Lin Yang (Condensed Matter Physics, National Chio Tung University (NCTU), Taiwan) Prof. Eiji Saitou (Condensed Matter Physics, IMR-Tohoku University)
Speakers of Tohoku University Assistant Prof. Katsuhiko Sato (Condensed Matter Physics) Assistant Prof. Tatsuro Yuge (Condensed Matter Physics) Assistant Prof. Shumpei Masuda (Condensed Matter Physics) Assistant Prof. Yoshihiro Ueda (Mathematics) Assistant Prof. Mamoru Tanaka (Mathematics) Assistant Prof. Hiroshi Takeda (Mathematics) Prof. Kazuhiro Ishige (Mathematics) Assistant Prof. Yousuke Itoh (Astrophysics) Assistant Prof. Mikito Tanaka (Astrophysics) Assistant Prof. Dirk Puetzfeld (Astrophysics) Assistant Prof. Ken-ichi Harada (Nuclear Physics) Assistant Prof. Hidekatsu Nemura (Nuclear Physics) Assistant Prof. Takeshi Koike (Nuclear Physics) Assistant Prof. Yohei Matsuda (Nuclear Physics) Assistant Prof. Masaki Asano (Particle Physics) Assistant Prof. Yoshiyuki Onuki (Particle Physics) Assistant Prof. Itaru Shimizu (Particle Physics - Neutrino) Associate Prof. Junpei Shirai (Particle Physics - Neutrino)
8 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Time Table
February 17 Thursday 2011
Plenary Session Main Lecture Hall “Opening” Kunio INOUE (Project Leader) 9:00 ~ 9:10
(Condensed Matter Physics ) Zhanghai Chen (Fudan University, China) 9:10 ~ 9:40
(Condensed Matter Physics ) Shunging Shen (University of Hong Kong) 9:40~10:１0
(Condensed Matter Physics ) Wu Ching Chou (NCTU, Taiwan) 10:10 ~10:40
Coffee Break 10:40 ~11:00
(Mathematics) Hi Jun Choe (Yonsei University, Korea) 11:00 ~11:30
(Mathematics) Hyunseok Kim (Sogang University, Korea) 11:30 ~12:00
(Nuclear Physics) Kiyoshi Tanida (Seoul National University, Korea) 12:00 ~12:30
Lunch 12:30 ~14:00
Parallel Session A, B, C Lecture rooms 203, 204, 303 A (Room 203) B (Room 204) C (Room 303) (Condensed Matter Physics ) （Particle Physics - Neutrino） （Mathematics） 14:00 ~14:25 Kun Ding Itaru Shimizu Hai-qing Zhao (Fudan Univ) (Tohoku Univ) (Shanghai JiaoTong Univ) (Condensed Matter Physics ) (Particle Physics - Neutrino) （Mathematics） 14:25 ~14:50 Danny Haberer Junpei Shirai Tong Zhou (IFW Dresden) (Tohoku Univ) (Shanghai JiaoTong Univ) Coffee Break 14:50 ~15:10
(Particle Physics) （Mathematics） (Condensed Matter Physics ) Chang Sub Shin Kazuhiro Ishige 15:10 ~15:35 Katsuhiko Sato (KAIST, Korea) (Tohoku Univ) (Tohoku Univ)
(Condensed Matter Physics ) (Particle Physics) （Philosophy） 15:35 ~16:00 Jing Fan Masaki Asano Wing-keung Lam (Jilin Univ) (Tohoku Univ) (Hong Kong Inst. of Educ.) (Condensed Matter Physics ) (Nuclear Physics ) （Philosophy） 16:00 ~16:25 Saifeng Zhang Takeshi Koike Ching-yuen Cheung (Chinese (Fudan Univ) (Tohoku Univ) Univ. of HK) (Condensed Matter Physics ) (Astrophysics ) Eiji Saitou Mikito Tanaka 16:25 ~16:50 (IMR-Tohoku Univ) (Tohoku Univ) <16:25~16:55>
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Poster Session Entrance hall 2F & Room 205 Entrance hall 2F & Room 205: 17:00 ~18:00 Posters will be exhibited until 13:30 of February 18 Fri.
18:20 ~20:00 Banquet at Campus Cafeteria
February 18 Friday 2011
Plenary Session Main Lecture Hall （Astrophysics） Myungshin Im (Seoul National Univ, Korea) 9: 00 ~ 9:30
（Mathematics） Zuo-Nong Zhu (Shanghai-SJTU, China) 9:30 ~ 10:00
(Particle Physics) Kai-Feng Chen (National Taiwan Univ) 10:00~10:30
Coffee Break 10:30~10:50
(Condensed Matter Physics ) Wen-Hao Chang (National Chiao Tung Univ, Taiwan) 10:50 ~11:20
(Condensed Matter Physics ) Chong-Yun Park (Sungkyunkwan Univ, Korea) 11:20 ~11:50
(Condensed Matter Physics ) Bingbing Liu (Jilin University, China) 11:50 ~12:20
(Condensed Matter Physics ) Di-Jing Huang (National Tsing Hua Univ, Taiwan) 12:20~12:50
Lunch 12:50~14:00
Interdisciplinary Research Session Lecture rooms 203 (Condensed Matter Physics ) Shumpei Masuda (Tohoku Univ) 14:00 ~14:25
（Mathematics） Hiroshi Takeda (Tohoku Univ) 14:25 ~14:50
(Particle Physics) Yoshiyuki Onuki (Tohoku Univ) 14:50 ~15:15
(Nuclear Physics ) Hidekatsu Nemura ( Tohoku Univ) 15:15 ~15:40
Coffee Break 15:40 ~16:00
Parallel Session A, B, C Lecture rooms 203, 204, 303 A (Room 203) B (Room 204) C (Room 303) Condensed Matter Physics ) (Astrophysics） （Mathematics） 16:00 ~16:25 Haizhou Lu Hyunsung Jun Yoshihiro Ueda (Univ of Hong Kong) (Seoul National Univ) (Tohoku Univ)
10 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
(Condensed Matter Physics ) (Astrophysics) （Mathematics） 16:25 ~16:50 Hongxing Dong Changsu Choi Mamoru Tanaka (Fudan Univ) (Seoul National Univ) (Tohoku Univ) (Condensed Matter Physics ) (Astrophysics ) （Nuclear Physics） 16:50 ~17:15 Chia-Hsien Lin Yousuke Itoh Ken-ichi Harada (NCTU) (Tohoku Univ) (Tohoku Univ) (Condensed Matter Physics ) (Astrophysics ) (Nuclear Physics ) 17:15 ~17:40 Tatsuro Yuge Dirk Puetzfeld Yohei Matsuda (Tohoku Univ) (Tohoku Univ) (Tohoku Univ) (Condensed Matter Physics ) 17:40 ~18:05 Yu-Lin Yang (NCTU) Poster Session Entrance hall 2F & Room 205 Entrance hall 2F & Room 205: 18:00 ~19:00 Posters will be exhibited until 10:45 of February 19 Sat
February 19 Saturday 2011
Plenary Session Main Lecture Hall 09:00 ~ 09:30 (Condensed Matter Physics ) Edward Y. Chang (National Chiao Tung Univ, Taiwan )
(Condensed Matter Physics ) Hyun-Woo Lee (Pohang Univ of Scie. and Tech., Korea) 9:30 ~ 10:00
(Condensed Matter Physics ) Quing He (Fudan University, China) 10:00 ~ 10:30
Coffee Break 10:30 ~ 10:45
(Particle Physics) Kiwoon Choi (KAIST, Korea) 10:45 ~ 11:15
(Philosophy) Jeu-Jenq Yuann (National Taiwan University) 11:15 ~ 11:45
Coffee Break 11:45 ~ 12:00
(Condensed Matter Physics ) Peichen Yu (National Chiao Tung Univ, Taiwan) 12:00 ~ 12:30
(Condensed Matter Physics ) Tian Cui (Jilin University, China) 12:30 ~ 13:00
“Closing” Yoshiro Hirayama (Chairman of Organizing Committee) 13:00 ~ 13:10
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Speakers/Titles
February 17 Thursday
09:00 – 09:10 Kunio INOUE (GCOE program leader) – ―Opening address‖ (Main Lecture Hall)
Plenary Session –Condensed Matter Physics, Mathematics, Nuclear Physics Chairmen Y. Hirayama / H. Kozono / H. Tamura Main Lecture Hall 09:10 – 09:40 (Chairman Y. Hirayama) Zhanghai Chen (Condensed Matter Physics, Fudan University) ―Quantum Chaotic Dynamics of Hydrogen-like atoms in Solid State Environment‖ 09:40 – 10:10 Shun-Qing Shen (Condensed Matter Physics, University of Hong Kong) ―Topological Insulator and Dirac Equation‖ 10:10 – 10:40 Wu Ching Chou (Condensed Matter Physics, National Chiao Tung University) ―Optical properties of II-VI semiconductor quantum dots‖ 10:40 – 11:00 Coffee Break 11:00 – 11:30 Hi Jun Choe (Mathematics, Yonsei University) (Chairman H. Kozono) ―Equation of guiding center motion‖ 11:30 – 12:00 Hyunseok Kim (Mathematics, Sogang University) ―Mathematical analysis of the stationary Navier-Stokes equations‖ 12:00 – 12:30 Kiyoshi Tanida (Nuclear Physics, Seoul National University) (Chairman H.Tamura ) ―Korean activities in nuclear and hadron physics at J-PARC‖ 12:30 – 14:00 Lunch Parallel Session A – Condensed Matter Physics Chairmen S. Masuda / T. Yuge Room203 14:00 – 14:25 Kun Ding (Condensed Matter Physics, Fudan University) (Chairman S. Masuda ) ―A chirality switching device designed with transformation optics‖ 14:25 – 14:50 Danny Haberer (Condensed Matter Physics, IFW Dresden) ―Electronic Properties of Hydrogenated Quasi-Free-Standing Graphene‖ 14:50 – 15:10 Coffee Break 15:10 – 15:35 Katsuhiko Sato (Condensed Matter Physics, Tohoku University) (Chairman T. Yuge) ―Onion structures induced by hydrophilic and hydrophobic ions in water-oil mixtures‖ 15:35 – 16:00 Jing Fan (Condensed Matter Physics, Jilin University) ―Structures and compressibility of magnesium borohydride at high-pressure: A first-principles study‖
12 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
16:00 – 16:25 Saifeng Zhang (Condensed Matter Physics, Fudan University) “The strong coupling between exciton and photon in ZnO whispering gallery (WG) cavity tuned by current induced thermal effect” 16:25 – 16:55 Eiji Saitou (Condensed Matter Physics, IMR-Tohoku University) ― ‖ Parallel Session B – Particle Physics, Nuclear Physics, Astrophysics Chairmen K. Inoue / M. Yamaguchi / Y. Matsuda Room204 14:00 – 14:25 Itaru Shimizu (Particle Physics -Neutrino, Tohoku University) (Chairman K. Inoue) ―Status of Reactor Neutrino Oscillation and Geo Neutrino Measurement in KamLAND‖ 14:25 – 14:50 Junpei Shirai (Particle Physics -Neutrino, Tohoku University) ―KamLAND-Zen for the Neutrino-less Double Beta Decay of 136Xe‖ 14:50 – 15:10 Coffee Break 15:10 – 15:35 Chang Sub Shin (Particle Physics, KAIST, Korea) (Chairman M. Yamaguchi) ―Sparticle Spectrum of Large Volume Compactification‖ 15:35 – 16:00 Masaki Asano (Particle Physics, Tohoku University) ―Natural Supersymmetric signal at the LHC‖ 16:00 – 16:25 Takeshi Koike (Nuclear Physics, Tohoku University) (Chairman Y. Matsuda) ―Hypernuclear γ-ray spectroscopy with Hyperball-J at J-PARC‖ 16:25 – 16:50 Mikito Tanaka (Astrophysics, Tohoku University) ―First Time Galactic Archaeology‖ Parallel Session C – Mathematics, Philosophy Chairman T. Shioya / K. Naoe Room303 14:00 – 14:25 Hai-qing Zhao (Mathematics, Shanghai Jiao Tong University) (Chairman T. Shioya) ―On the discrete coupled Hirota equation‖ 14:25 – 14:50 Tong Zhou (Mathematics, Shanghai Jiao Tong University) ―Explicit solutions to a semidiscrete integrable equation‖ 14:50 – 15:10 Coffee Break 15:10 – 15:35 Kazuhiro Ishige (Mathematics, Tohoku university) ―Convexity breaking of the free Boundary for porous medium equations‖ 15:35 – 16:00 Wing-keung Lam (Philosophy, Hong Kong Inst. of Education) (Chairman K. Naoe) ―Kagaku and rigaku: a philosophical perspective of ―science‖ ‖ 16:00 – 16:25 Ching-yuen Cheung (Philosophy, Chinese University of Hong Kong) ―Removing the fence between science and liberal arts - General education and its promise‖
Poster Session Entrance-hall 2Fand Room205
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17:00 – 18:00 Entrance-hall 2F: Exhibit = odd number of Poster no. 1~39 Room 205 ：Exhibit = odd number of Poster no. 41~103
Information on international exchange and entering Tohoku University from overseas: Board no. 101-104 18:20 – 20:00 Banquet at Campus Cafeteria
February 18 Friday
Plenary Session – Astrophysics, Mathematics, Particle-, Condensed Matter-Physics Chairmen T. Futamase / Y.Kuramoto Main Lecture Hall (Chairman T. Futamase) 09:00 -09:30 Myungshin Im (Astrophysics, Seoul National University) ―Monsters in Early Universe‖ 09:30 – 10:00 Zuo-Nong Zhu (Mathematics, Shanghai Jiao Tong University) ―Integrability of the semidiscrete systems‖ 10:00 – 10:30 Kai-Feng Chen (Particle Physics, National Taiwan University) ―Search for Fourth Generation Quarks at CMS‖ 10:30 – 10:50 Coffee Break (Chairman Y. Kuramoto) 10:50 – 11:20 Wen-Hao Chang (Condensed Matter Physics, National Chiao Tung University) ―Single Semiconductor Nanostructures for Quantum Photonics Applications‖ 11:20 – 11:50 Chong-Yun Park (Condensed Matter Physics, Sungkyunkwan University) ―Controlled Synthesis of Low-dimensional Structures and Their Properties: Nanotube, Graphene, and Atomic wire on Si Surface‖ 11:50 – 12:20 Bingbing Liu (Condensed Matter Physics, Jilin University) ―Structural studies on carbon nanostrucutured materials under high pressure‖ 12:20 – 12:50 Di-Jing Huang (Condensed Matter Physics, National Tsing Hua University) ―Electronic and Magnetic Properties of Transition-Metal Oxides Probed with X-ray Spectroscopy‖ 12:50 – 14:00 Lunch Interdisciplinary Research Session – Condensed Matter Physics, Mathematics, Particle-, Nuclear- Physics Chairmen K. Sato / Y. Ueda / K. Tanida Room203 14:00 – 14:25 Shumpei Masuda (Condensed Matter Physics, Tohoku University) (Chairman K. Sato ) ―Acceleration of quantum dynamics: Ideal manipulation of quantum states‖
14 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
14:25 – 14:50 Hiroshi Takeda (Mathematics, Tohoku University) (Chairman Y. Ueda ) ―Asymptotic profile of the solutions for nonlinear damped beam equations‖ 14:50– 15:15 Yoshiyuki Onuki (Particle Physics, Tohoku University) (Chairman K. Tanida) ―Prospects and Status of Belle II experiment‖ 15:15 – 15:40 Hidekatsu Nemura (Nuclear Physics, Tohoku University) ―Lattice QCD study of hyperonic interactions‖ 15:40 – 16:00 Coffee Break Parallel Session A – Condensed Matter Physics Chairman K. sato Room203 16:00 – 16:25 Haizhou Lu (Condensed Matter Physics, University of Hong Kong) (Chairman K. Sato ) ―Thin Film of Topological Insulator‖ 16:25 – 16:50 Hongxing Dong (Condensed Matter Physics, Fudan University) ―Single-crystalline polyhedral indium oxide optical resonators‖ 16:50 – 17:15 Chia-Hsien Lin (Condensed Matter Physics, National Chiao Tong University) ―Excitonic fine structures in single self-assembled quantum dots under extrenal magnetic and strain fields‖ 17:15 – 17:40 Tetsuro Yuge (Condensed Matter Physics, Tohoku University) ―Sum rule for optical conductivity of nonequilibrium state in strongly correlated electron system‖ 17:40 – 18:05 Yu-Lin Yang (Condensed Matter Physics, National Chiao Tong University) ―Growth and optical properties of ZnO:(Mn,Mg,Se) epilayers grown by plasma assisted molecular beam epitaxy‖ Parallel Session B – Astrophysics Chairman M. Tanaka Room204 16:00 – 16:25 Hyunsung Jun (Astrophysics, Seoul National University) (Chairman M. Tanaka) ―Black Hole Mass Measurements with Rest-frame Optical Quasar Spectra at 3 < z < 5 ‖ 16:25 – 16:50 Changsu Choi (Astrophysics, Seoul National University) ―Y-band Imaging of Extragalactic fields‖ 16:50 – 17:15 Youseke Itoh (Astrophysics, Tohoku University) ―Reach of LCGT in a continuous gravitational wave search‖ 17:15 – 17:40 Dirk Puetzfeld (Astrophysics, Tohoku University) ―Equations of motion in General Relativity‖ Parallel Session C – Mathematics, Nuclear Physics Chairmen M. Nakamura / K. Miwa Room303 16:00 – 16:25 Yoshihiro Ueda (Mathematics, Tohoku University) (Chairman M. Nakamura) ―Time asymptotic decay of solutions for the Euler-Maxwell system‖ 16:25 – 16:50 Mamoru Tanaka (Mathematics, Tohoku University) ―p-Laplacian on finitely generated groups‖
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16:50 – 17:15 Ken-ichi Harada (Nuclear Physics, Tohoku University) (Chairman K. Miwa) ―Search for a permanent EDM using cold Fr atoms‖ 17:15 – 17:40 Yohei Matsuda (Nuclear Physics, Tohoku University) ―Elastic Scattering of Protons with RI beams‖ Poster Session Entrance-hall 2Fand Room205
18:00 – 19:00 Entrance-hall 2F: Exhibit = even number of Poster no. 2~40 Room 205: Exhibit = even number of Poster no. 42~104
Information on international exchange and entering Tohoku University from overseas: Board no. 101-104
February 19 Saturday
Plenary Session – Condensed Matter Physics, Particle Physics, Philosophy Chairmen K. Tanigaki / A. Yamaguhi / K. Naoe / T. Takahashi Main Lecture Hall (Chairman K. Tanigaki ) 09:00 -09:30 Edward Y. Chang (Condensed Matter Physics, National Chiao Tung University) ―Ultra-Scaled III-V Green Quantum-Well Device for future high-speed and Beyond Moor‘s Law Logic Applications‖ 09:30 – 10:00 Hyun-Woo Lee (Condensed Matter Physics, Pohang University of Scie. and Tech.) ―Magnetic nanostructure control by spin transfer‖ 10:00 – 10:30 Qiong He (Condensed Matter Physics, Fudan University) ―Light manipulation by metamaterials‖ 10:30 – 10:45 Coffee Break 10:45 – 11:15 Kiwoon Choi (Particle Physics, KAIST, Korea) (Chairman M. Yamaguchi ) ―Exploring Physics Beyond the Standard Model of Particle Physics‖ 11:15 – 11:45 Jeu-Jenq Yuann (Philosophy, National Taiwan University) (Chairman K. Naoe ) ―The Negative Role of Empirical Stimulus in Theory Change: W. V. Quine and P. Feyerabend‖ 11:45 – 12:00 Coffee Break 12:00 – 12:30 (Chairman T. Takahashi ) Peichen Yu (Condensed Matter Physics, National Chiao Tung University) ―High Efficiency Triple-Junction Solar Cells Employing Biomimetic Antireflective Structures‖ 12:30 – 13:00 Tian Cui (Condensed Matter Physics, Jilin University) ―New high pressure phases of some typical molecular solids‖ 13:00 – 13:10 Yoshiro Hirayama (Chairman of Organizing Committee) – ―Closing address‖
16 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Talks
Feb 17 Plenary Session Talk-01 “Quantum Chaotic Dynamics of Hydrogen-like atoms in Solid State Environmen” Zhanghai Chen (Condensed Matter Physics, Fudan University)
Talk-02 “Topological Insulator and Dirac Equation” Shun-Qing Shen (Condensed Matter Physics, University of Hong Kong)
Talk-03 “Optical properties of II-VI semiconductor quantum dots” Wu Ching Chou (Condensed Matter Physics, Fudan University)
Talk-04 “Equation of guiding center motion” Hi Jun Choe (Mathematics, Yonsei University
Talk-05 “Mathematical analysis of the stationary Navier-Stokes equations” Hyunseok Kim (Mathematics, Sogang University)
Talk-06 “Korean activities in nuclear and hadron physics at J-PARC” Kiyoshi Tanida (Nuclear Physics, Seoul National University)
Feb 17 Parallel Session A – Condensed Matter Physics Talk-07 “A chirality switching device designed with transformation optics” Kun Ding (Condensed Matter Physics, Fudan University)
Talk-08 “Electronic Properties of Hydrogenated Quasi-Free-Standing Graphene” Danny Haberer (Condensed Matter Physics, IFW Dresden)
Talk-09 “Onion structures induced by hydrophilic and hydrophobic ions in water-oil mixtures” Katsuhiko Sato (Condensed Matter Physics, Tohoku University)
Talk-10 “Structures and compressibility of magnesium borohydride at high-pressure: A first-principles study” Jing Fan (Condensed Matter Physics, Jilin University)
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Talk-11 “The strong coupling between exciton and photon in ZnO whispering gallery (WG) cavity tuned by current induced thermal effect” Saifeng Zhang (Condensed Matter Physics, Fudan University)
Talk-12 “” Eiji Saitou (Condensed Matter Physics, Tohoku University)
Feb 17 Parallel Session B – Particle Physics / Nuclear Physics / Astrophysics Talk-13 “Status of Reactor Neutrino Oscillation and Geo Neutrino Measurement in KamLAND” Itaru Shimizu (Particle Physics -Neutrino, Tohoku University)
Talk-14 “KamLAND-Zen for the Neutrino-less Double Beta Decay of 136Xe” Junpei Shirai (Particle Physics -Neutrino, Tohoku University)
Talk-15 “Sparticle Spectrum of Large Volume Compactification” Chang Sub Shin (Particle Physics, KAIST, Korea)
Talk-16 “Natural Supersymmetric signal at the LHC” Masaki Asano (Particle Physics, Tohoku University)
Talk-17 “Hypernuclear γ-ray spectroscopy with Hyperball-J at J-PARC” Takeshi Koike (Nuclear Physics, Tohoku University)
Talk-18 “First Time Galactic Archaeology” Mikito Tanaka (Astrophysics, Tohoku University)
Feb 17 Parallel Session C - Mathematics / Philosophy Talk-19 “On the discrete coupled Hirota equation” Hai-qing Zhao (Mathematics, Shanghai Jiao Tong University)
Talk-20 “Explicit solutions to a semidiscrete integrable equation” Tong Zhou (Mathematics, Shanghai Jiao Tong University)
Talk-21 “Convexity breaking of the free Boundary for porous medium equations” Kazuhiro Ishige (Mathematics, Tohoku university)
18 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Talk-22 “Kagaku and rigaku: a philosophical perspective of “science” ” Wing-keung Lam (Philosophy, Hong Kong Inst. of Education)
Talk-23 “Removing the fence between science and liberal arts - General education and its promise” Ching-yuen Cheung (Philosophy, Chinese University of Hong Kong)
Feb 18 Plenary Session Talk-24 “Monsters in Early Universe” Myungshin Im (Astrophysics, Seoul National University)
Talk-25 “Integrability of the semidiscrete systems” Zuo-Nong Zhu (Mathematics, Shanghai Jiao Tong University)
Talk-26 “Search for Fourth Generation Quarks at CMS” Kai-Feng Chen (Particle Physics, National Taiwan University)
Talk-27 “Single Semiconductor Nanostructures for Quantum Photonics Applications” Wen-Hao Chang (Condensed Matter Physics, National Chiao Tung University)
Talk-28 “Controlled Synthesis of Low-dimensional Structures and Their Properties: Nanotube, Graphene, and Atomic wire on Si Surface” Chong-Yun Park (Condensed Matter Physics, Sungkyunkwan University)
Talk-29 “Structural studies on carbon nanostrucutured materials under high pressure” Bingbing Liu (Condensed Matter Physics, Jilin University)
Talk-30 “Electronic and Magnetic Properties of Transition-Metal Oxides Probed with X-ray Spectroscopy” Di-Jing Huang (Condensed Matter Physics, National Tsing Hua University)
Feb 18 Interdisciplinary Research Session Talk-31 “Acceleration of quantum dynamics: Ideal manipulation of quantum states” Shumpei Masuda (Condensed Matter Physics, Tohoku University)
Talk-32 “Asymptotic profile of the solutions for nonlinear damped beam equations” Hiroshi Takeda (Mathematics, Tohoku University)
| 19 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy”
Talk-33 “Prospects and Status of Belle II experiment” Yoshiyuki Onuki (Particle Physics, Tohoku University)
Talk-34 “Lattice QCD study of hyperonic interactions” Hidekatsu Nemura (Nuclear Physics, Tohoku University)
Feb 18 Parallel Session A – Condensed Matter Physics Talk-35 “Thin Film of Topological Insulator” Haizhou Lu (Condensed Matter Physics, University of Hong Kong)
Talk-36 “Single-crystalline polyhedral indium oxide optical resonators” Hongxing Dong (Condensed Matter Physics, Fudan University)
Talk-37 “Excitonic fine structures in single self-assembled quantum dots under extrenal magnetic and strain fields” Chia-Hsien Lin (Condensed Matter Physics, National Chiao Tong University)
Talk-38 “Sum rule for optical conductivity of nonequilibrium state in strongly correlated electron system” Tetsuro Yuge (Condensed Matter Physics, Tohoku University)
Talk-39 “Growth and optical properties of ZnO:(Mn,Mg,Se) epilayers grown by plasma assisted molecular beam epitaxy” Yu-Lin Yang (Condensed Matter Physics, National Chiao Tong University)
Feb 18 Parallel Session B – Astrophysics Talk-40 “Black Hole Mass Measurements with Rest-frame Optical Quasar Spectra at 3 < z < 5 ” Hyunsung Jun (Astrophysics, Seoul National University)
Talk-41 “Y-band Imaging of Extragalactic fields” Changsu Choi (Astrophysics, Seoul National University)
Talk-42 “Reach of LCGT in a continuous gravitational wave search” Youseke Itoh (Astrophysics, Tohoku University)
Talk-43 “Equations of motion in General Relativity”
20 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Dirk Puetzfeld (Astrophysics, Tohoku University)
Feb 18 Parallel Session C - Mathematics / Nuclear Physics Talk-44 “Time asymptotic decay of solutions for the Euler-Maxwell system” Yoshihiro Ueda (Mathematics, Tohoku University)
Talk-45 “p-Laplacian on finitely generated groups” Mamoru Tanaka (Mathematics, Tohoku University)
Talk-46 “Search for a permanent EDM using cold Fr atoms” Ken-ichi Harada (Nuclear Physics, Tohoku University)
Talk-47 “Elastic Scattering of Protons with RI beams” Yohei Matsuda (Nuclear Physics, Tohoku University)
Feb 19 Plenary Session Talk-48 “Ultra-Scaled III-V Green Quantum-Well Device for future high-speed and Beyond Moor‟s Law Logic Applications” Edward Y. Chang (Condensed Matter Physics, National Chiao Tung University)
Talk-49 “Magnetic nanostructure control by spin transfer” Hyun-Woo Lee (Condensed Matter Physics, Pohang University of Scie. and Tech.)
Talk-50 “Light manipulation by metamaterials” Qiong He (Condensed Matter Physics, Fudan University)
Talk-51 “Exploring Physics Beyond the Standard Model of Particle Physics” Kiwoon Choi (Particle Physics, KAIST, Korea)
Talk-52 “The Negative Role of Empirical Stimulus in Theory Change: W. V. Quine and P. Feyerabend” Jeu-Jenq Yuann (Philosophy, National Taiwan University)
Talk-53 “High Efficiency Triple-Junction Solar Cells Employing Biomimetic Antireflective Structures” Peichen Yu (Condensed Matter Physics, National Chiao Tung University)
Talk-54 “New high pressure phases of some typical molecular solids”
| 21 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy”
Tian Cui (Condensed Matter Physics, Jilin University)
Poster presentations P- no. Title / Name 1. Optical properties of metal-dielectric multilayer metamaterial Aunuddin Syabba Vioktalamo (Physics, D1, Tohoku Univ.) 2. Coherent control of the selected excited state by two-color multipulse excitation Kenta Abe (Physics, D3, Tohoku Univ.) 3. Analytical calculation of 3loop Master Integrals in perturbative QCD Chihaya Anzai (Physics, D1, Tohoku Univ.)
4. Single Crystal Structure Analysis of Rb3H(SeO4)2 in the High-Temperature Phase by Neutron Diffraction Yoshihisa Ishikawa (Physics, D3, Tohoku Univ.) 5. Study of the B→D*pi decay for CP violation measurement Ken-nosuke Itagaki (Physics, D1, Tohoku University) 6. Determination of Superparticle Properties with Long-lived Stau at the LHC Takumi Ito (Physics, D2, Tohoku University) 7. Crack patterns in nonlinear elastic films Daiki Endo (Physics, D2, Tohoku University) 8. Tunneling time of optical pulse in photonic band gap Rihei Endo (Physics, D3, Tohoku University) 9. E1 transition of 17Ne nucleus with core + 2-proton model Tomohiro Oishi (Physics, D1, Tohoku University) 10. Deformation of Amphiphilic Membranes Containing Polymers Yutaka Oya (Physics, D1, Tohoku University) 11. Controlled dephasing and shot noise studies in a Kondo-correlated parallel double quantum dot Yuma Okazaki (Physics, D2, Tohoku University) 12. Photoproduction of neutral kaon and lambda near the threshold region at ELPH Akira Okuyama (Physics, D1, Tohoku University) 13. Photo-induced effects in correlated electron system ith spin-state degree of freedom Yu Kanamori (Physics, D3, Tohoku University) 14. The third generation precise hypernuclear spectroscopic experiment via (e,e‟K+) reaction at JLab Hall-C Daisuke Kawama (Physics, D3, Tohoku University) 15. The double pion photoproduction on the deuteron Chigusa Kimura (Physics, D1, Tohoku University) 16. Optical Rectification Effect in Asymmetric Photonic Crystal Slabs
22 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Hiroyuki Kurosawa (Physics, D1, Tohoku University) 17. A Study of Large Scale Structures at High Redshifts with Lyman Break Galaxy Spectroscopic Survey around a Proto-cluster of Galaxies Katsuki Kousai (Physics, D3, Tohoku University) 18. TiN-MKIDs for CMB Polarization observation Kensuke Koga (Physics, D1, Tohoku University) 19. EELS and SXES studies of electronic structures of Zn-Mg-Zr alloys Shogo Koshiya (Physics, D2, Tohoku University) 20. Search for pentaquark at J-PARC K1.8 beam line Koutaro Shiratori (Physics, D3, Tohoku University)
21. Magnetism and superconductivity in noncentrosymmetric heavy-fermion CeRhSi3 Tetsuya Sugawara (Physics, D3, Tohoku University) 22. Study of baryon properties via π0η photoproduction Koutaku Suzuki (Physics, D3, Tohoku University)
23. Study of decay B->DK,D->KSK for the measurement of the CP-violating angle 3 Zenmei Suzuki (Physics, D1, Tohoku University) 24. Ionic transport in supercooled liquid state of trehalose-water-lithium iodide Reiji Takekawa (Physics, D2, Tohoku University) 25. Status of the Double Chooz experiment Hirosi Tabata (Physics, D3, Tohoku University) 26. Nahm transformation and T-duality Yoshiro Teshima (Physics, D1, Tohoku University) 27. Single Polymer Dynamics by Particle-Field Hybrid Models Masatoshi Toda (Physics, D3, Tohoku University) 28. Charge dynamics in charge ordered system with frustrated geometrical lattice Makoto Naka (Physics, D3, Tohoku University) 29. Study of light hypernuclei with Stochastic Variational Method Yoji Nakagawa (Physics, D2, Tohoku University) 30. Ultrafast photoinduced melting of charge order in organic conductor Hideki Nakaya (Physics, D3, Tohoku University)
31. Single-crystal structure analysis of spinel oxide FeV2O4 having orbital degree of freedom both in Fe and V ions Yoichi Nii (Physics, D2, Tohoku University) 32. Photoproduction of the ω-meson on the proton near the threshold Ryo Hashimoto (Physics, D3, Tohoku University) 33. Ground state phase diagram and fractional quantum Hall states of graphene in a high Landau level: A DMRG study Tatsuya Higashi (Physics, D2, Tohoku University) 34. Investigation of K0 Photoproduction near the Threshold
| 23 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy”
Kenta Futatsukawa (Physics, D3, Tohoku University) 35. Analysis of text structure by investigating how sentences line up Sho Furuhashi (Physics, D3, Tohoku University) 36. Itinerant-Localized Transition in Two-Channel Kondo Lattice Shintaro Hoshino (Physics, D2,Tohoku University)
37. Space group determination of charge- and orbital-ordered phases of SmBaMn2O6 using convergent-beam electron diffraction Daisuke Morikawa (Physics, D2, Tohoku University)
38. Dopant dependence on charge/orbital orderings in La0.5Sr1.5MnO4 observed by resonant x-ray scattering Yuuki Yamaki (Physics, D1, Tohoku University) 39. Semi-classical coupled-channels calculation for heavy-ion reactions Shusaku Yusa (Physics, D1, Tohoku University)
40. Crystalline electric field study in pyrochlore-type iridate Nd2Ir2O7 with metal-insulator transition Masanori Watahiki (Physics, D1, Tohoku University) 41. Back action control of GaAs mechanical resonator by carrier excitation Takayuki Watanabe (Physics, D1, Tohoku University)
42. Study of the charge dynamics in Sr14-xCaxCu24O41 by resonant inelastic x-ray scattering Masahiro Yoshida (Physics, D2, Tohoku University) 43. Terahertz beam control using femtosecond laser interference technique Kouji Uematsu (Physics, D1, Tohoku University) 44. Metal-Contact Effect on Short Channel Graphene Field-Effect Transistors Nobuhiko Mitoma (Physics, D1, Tohoku University) 45. Triaxial Deformation of sd-shell Lambda Hypernuclei Myaing Thi Win (Physics, D1, Tohoku University) 46. Excitation energy dependence of coherent phonon amplitudes in single wall carbon nanotubes Ahmad Ridwan Tresna Nugraha (Physics, D1, Tohoku University) 47. Calculation for Vibrational and NMR properties of Polyynes And Microscopic studies of Polyynes@SWNT MD. Mahabubul Haque (Physics, D1, Tohoku University) 48. The new generation experiment of hypernuclear γ-ray spectroscopy at J-PARC Taofun Wan (Physics, D1, Tohoku University) 49. Towards a double beta decay experiment with KamLAND Azusa Gando-Terashima (Physics, D2, Tohoku University) 50. Dead-time free DAQ with MoGURA and its contribution to KamLAND experiment Yasuhiro Takemoto (Physics, D2, Tohoku University) 51. Orbital Degenerate System in Frustrated Checkerboard Lattice
24 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Joji Nasu (Physics, D3, Tohoku University) 52. Gamma-ray spectroscopy of 19F-lambda Kenji Hosomi (Physics, D2, Tohoku University) 53. First Evidence of the Suppressed B Meson Decay B-DK-, DK+- Yasuyuki Horii (Physics, D3, Tohoku University)
54. Transition of the Fermi surface topology in highly-doped NaxCoO2 Toshiyuki Arakane (Physics, D3, Tohoku University) 55. Study of B-pi tagging method at the Y(5S) resonance for the measurement of CP-violation parameter sin2phi1 Yutaro Sato (Physics, D1, Tohoku University) 56. Anomalous Rashba effect of Bi(111) surface studied by high-resolution spin-resolved ARPES Akari Takayama (Physics, D1, Tohoku University) 57. Hypernuclear -ray spectroscopy system: Hyperball-J Takeshi Yamamoto (Physics, D1, Tohoku University) 58. Phase diagram and critical exponent of metal-insulator transition in disordered topological insulator Ai Yamakage (Physics, D3, Tohoku University) 59. Quasinormal modes of small Kerr-AdS black holes Nami Uchikata (Astronomy, D1, Tohoku University) 60. Test of inflation Naonori Sugiyama(Astronomy, D1, Tohoku University) 61. Loop Quantum Cosmology –path integral analysis- Kazuya Fujio (Astronomy, D1, Tohoku University) 62. Development of refractive Fourier Transform Spectrometer to realize multiband modulator for polarizing signal in millimeter and THz wave bands Luo Yuan (Astronomy, D3, Tohoku University) 63. Planetary Spectra Libraries Ramsey Guy Lundock (Astronomy, D2, Tohoku University) 64. Resuming cosmological perturbations via the Lagrangian picture: Two-loop result in real space Tomohiro Okamura (Astronomy, D1, Tohoku University) 65. Network Games with Many Attackers and Defenders Ahmad Termimi Bin Ab Ghani (Mathematics, D2, Tohoku University) 66. On the topology of singularities of polynomial maps Kazamasa Inaba ( Mathematics, D1, Tohoku University) 67. Well-posedness and ill-posedness for some nonlinear parabolic equations Tsukasa Iwabuchi (Mathematics, D3, Tohoku University) 68. Imperfect bifurcation for the Liouville-Gel'fand equation on a perturbed annulus Toru Kan (Mathematics, D2, Tohoku University)
| 25 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy”
69. Rigid Analytic Continuation of a Hypergeometric series and arithmetic-geometric mean over 2-adic fields Kensaku Kinjo (Mathematics, D3, Tohoku University) 70. On the Hasse principle on several fields Makoto Sakagaito (Mathematics, D3, Tohoku University) 71. On some problems in Non-abelian iwasawa theory Kazuaki Tajima (Mathematics, D2, Tohoku University) 72. Pattern formation by a head regeneration model of Hydra based on receptor-ligand reaction Madoka Nakayama (Mathematics, D3, Tohoku University) 73. On the Mordell-Weil groups of Mordell curves Tadashisa Nara (Mathematics, D3, Tohoku University) 74. Large deviation principle for additive functionals of symmetric α-stable processes weighted by Feynman-Kac functionals Yasuhito Nishimori (Mathematics, D2, Tohoku University) 75. Meromorphic periodic decomposition of entire functions Takano Negishi (Mathematics, D3, Tohoku Univercity) 76. How difficult to solve an unsolvable problem? Kojiro Higuchi (Mathematics, D2, Tohoku University) 77. Concatenation theory, and rverse mathematics of complex analysis and algebra Yoshihiro Horihata (Mathematics, D3, Tohoku University) 78. Feynman-Kac Penalisation Problems for Additive Functionals with Symmetric Jumps Masakuni Matsuura (Mathematics, D2, Tohoku University) 79. Global behavior of solutions for a mathematical model describing amoeba motion Harunori Monobe (Mathematics, D2, Tohoku University) 80. Hadamardvariational formula for the Green matrix of the Stokes equation Erika Ushikoshi (Mathematics, D1, Tohoku University) 81. An approach to the existence for harmonic maps and Yang-Mills connections Toshiaki Omori (Mathematics, D3, Tohoku University) 82. Restricted Caratheodory measure and restricted volume of canonical bundle Shin Kikuta (Mathematics, D2, Tohoku University) 83. Global and local noncomputability of simply connected zero sets Takayuki Kihara (Mathematics, D2, Tohoku University) 84. On the excess theorem for polynomial spaces Hirotake Kurihara (Mathematics, D2, Tohoku University) 85. Propagation of real analyticity for the Euler equations Ryo Takada (Mathematics, D2, Tohoku University) 86. Blow-up set for a semilinear heat equation and pointedness of the initial data
26 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Youhei Fujishima (Mathematics, D1, Tohoku University) 87. The Cauchy problem for heat equations with exponential nonlinearity Norisuke Ioku (Mathematics, D3, Tohoku University) 88. An inquiry into the ethical significance of the precautionary principle: How to make decisions under uncertainty Yasuhiko Fujio (Philosophy, D3, Tohoku University) 89. The ontological genesis and structure of the theoretical attitude Tetsurou Yamashita (Philosophy, D3, Tohoku University) 90. The Distinction between Social and Epistemic Values in Scientific Inquiry Mariko Nihei (Philosophy, D3, Tohoku University) 91. The Faces of Perceptual Object Shun Sato (Philosophy, D3, Tohoku University) 92. Truth and Evidence: A Study of Husserl‟s Theory of Truth Yushi Kajio (Philosophy, D2, Tohoku University) 93. Hume on the Analyticity on „Relations of Idea‟ Hiromichi Sugawara (Philosophy, D1, Tohoku University) 94. In Dialogue with Nature: A Core-text General Education Course Bridging Science and Humanity Ka Wai Chan (Philosophy, The Chinese University of Hong Kong) 95. Merging Features and Optical-NIR Color Gradient of Early-type Galaxies Duho Kim (Astronomy, Master, Seoul National University, Korea) 96. Correlation between galaxy mergers and AGN activity Jueun Hong (Astronomy, Master, Seoul National University, Korea) 97. Measurement of X-Rays from Ξ−Atom in J-PARC Seongbae Yang (Nuclear Physics, Seoul National University, Korea) 98. The Raman Study Of Hydrazine Monohydrate Under High Pressure Shuqing Jiang (Condensed Matter Physics, Jilin University, China) 99. New high pressure phase of GeH3 Pugeng Hou (Condensed Matter Physics, Jilin University, China) 100. The notions between Martin-L¨of randomness and 2-randomness Nei-nei Pon (Mathematics, Tohoku University) 101. International Exchange (1) 102. International Exchange (2) 103. Entering Tohoku University from overseas (1) 104. Entering Tohoku University from overseas (2) 105. Precision measurement of Little Higgs with T-parity parameters at the International Linear Collider, Eriko Kato (Physics, M1, Tohoku University) 106. Reserch and development of the fine-pixel CCD readout system for the vertexing detector at International linear collider, Tomoyuki Saito (Physics, M2, Tohoku University)
| 27 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy”
Abstracts of Talks
Feb 17 Plenary Session Talk-01 Quantum Chaotic Dynamics of Hydrogen-like atoms in Solid State Environment
Zhanghai Chen, Weihang Zhou, Bo Zhang, Wei Lu, and S. C. Shen Department of Physics, Fudan University and National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, CHINA
In this talk, I will report the magneto-optical spectroscopic study of quantum chaotic motion of shallow impurities in Si. In an ultra-pure single crystal Si with residual P donors, the anisotropic diamagnetic Kepler problem (ADKP) is realized experimentally by the orbital electrons of a hydrogenic donor under magnetic fields. The interference of electron wave packets which leads to quasi-Landau resonances (QLR) was observed. Applying the closed-orbit theory to an anisotropic solid state environment, we have identified orbits responsible for the QLR manifesting the quantum chaotic behavior in Rydberg atoms. The excellent consistency between the measured spectra and theoretical calculation provides unambiguous evidence of quantum chaotic dynamics of electrons in the ADKP. In addition to the QLR, the chaoticity of the system dynamics was quantified by means of energy level statistics. We analyzed the magnetic field dependence of the statistical distribution of the impurity energy levels and found a smooth transition between the Poisson limit and the Wigner limit, i.e. transition between regular Poisson and fully chaotic Wigner dynamics. Effect of the crystal field anisotropy on the quantum chaotic dynamics, which manifests itself in characteristic transitions between regularity and chaos for different field orientations, was demonstrated. Reference: (1). Zhanghai Chen, Weihang Zhou, Bo Zhang, C. H. Yu, Jingbing Zhu, Wei Lu, and S. C. Shen, ―Realization of Anisotropic Diamagnetic Kepler Problem in a Solid State Environment‖, Phys. Rev. Lett. 102, 244103 (2009) (2). Weihang Zhou, Zhanghai Chen, Bo Zhang, C. H. Yu, Wei Lu, and S. C. Shen ―Magnetic Field Control of the Quantum Chaotic Dynamics of Hydrogen Analogs in an Anisotropic Crystal Field‖, Phys. Rev. Lett. 105, 024101 (2010)
28 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Talk-02 Topological Insulator and Dirac equation
Shun-Qing Shen Department of Physics, The University of Hong Kong
Topological insulator is an insulator that always has a metallic boundary. These metallic boundaries originate from the topology of the band structure of solids, which is insensitive to the geometry of system and cannot change as long as the material remains insultating. A topological insulator is characteristic of topological invariant, not the order parameters such as in ferromagnet and superconductors. The first topological state of matter is the quantum Hall state, the Hall conductance of which is insensitive to continuous changes in the parameters and depends only on the number of edge states, which are unidirectional because of the breaking of the time reversal symmetry due to the magnetic field. This effect was generalized to the system with time reversal symmetry: it was shown that a class of insulators, such as graphene with spin orbit coupling and an "inverted" semiconductor HgTe/CdTe quantum well, possess the topological property that they have a single pair of counter-propagating or helical edge state, exhibiting the phenomenon of the quantum spin Hall effect. This "topological insulator" is distinguished from an ordinary band insulator by a Z₂-topological invariant, analogous to the Chern number classification of the quantum Hall effect. The prediction of quantum conductance in a band-insulating region of an "inverted" HgTe/CdTe quantum well has been verified experimentally. The generalization of this new state from two dimension to three dimension is non-trivial. In three dimensional topological insulators, the electron momentum in the surface states is locked in with the electron spin and electrons form a Dirac cone due to strong spin orbit coupling. The even or odd number of the Dirac cones over the Fermi level is a topological invariant. The one or odd number of the boundary states is topologically non-trivial and are insensitive to the impurities or geometry. A series of materials such as Bi2Se3 and
Bi2Te 3have been verified to be topological insulators.
In this talk we first present an introduction to topological insulator and then present a simple but unified description for a large family of topological insulators based on a modified Dirac equation. A series of solutions are presented to demonstrate the existence of edge and surface states in topological insulators and topological superconductors.
Talk-03
| 29 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy”
Talk-04 Equation of guiding center motion
Prof. Hi Jun Choe Yonsei University
In a constant magnetic field, a charged particle moves along a helix with constant parallel velocity and vertical velocity with respect to the magnetic field direction. The magnetic field balances the centrifugal force and the center of gyration which is guiding center is fixed in the normal plane to the magnetic field. The gyration frequency and the gyration radius are fixed constants, and the projected position in the normal plane changes as the gyroangle changes. If the magnetic field is not constant, the motion of charged particle is quite irregular. The effort to develop Hamiltonian mechanics of the guiding center starting from Littlejohn leads to the modern gryocenter Lie-transform noncanonical Hamiltonian theory (Cary-LIttlejohn, Cary-Brizard, Brizard-Hahm). In this view, the Hamiltonian is defined in the given order and the phase variables are also defined to match the approximation order, and the Lagrange stationary principle provides several invariant properties by Noether theorem. In particular the gyration motion is isolated to the generalized phase angle and the conjugate phase variable, which is the generalized magnetic moment is time invariant. Nevertheless the modern gyrocenter theory is difficult to apply in the computation of a higher order mechanical model and the phase variables are obscure in physical meaning. In this talk, we revitalize the idea of Kruskal(1962) for the almost periodic system. But we think our scheme is superior to Kruskal in the definition of guiding center and phase variables. Compared to Kruskal‘s idea we exploit the structure of Hamiltoian system in the intrinsic magnetic coordinate, and the time scale difference.
Talk-05 Mathematical analysis of the stationary Navier-Stokes equations
Hyunseok Kim Sogang University Abstract: The Dirichlet problem for the stationary Navier-Stokes equations in a domain of R 3 is studied in the q framework of L spaces. We assume that the external force is given by f = div F for some matrix-valued function F. Existence of at least one weak solution was established by a French mathematician J. Leray in his famous 1933 paper, provided that F L2 () . In this talk, I will review some recent extensions of Leray's results
to general Lebesgue L q spaces or even Lorentz L q, r space for both bouned and exterior domains .
30 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Talk-06 Korean activities in nuclear and hadron physics at J-PARC
Kiyoshi Tanida Department of Physics and Astronomy, Seoul National University Abstract: J-PARC (Japan Proton Accelerator Research Complex) is an accelerator-based research facility which provides the ever-strongest secondary beams such as neutrons, mesons, and neutrinos. Utilizing its intense beams, many experiments are planned in many research fields, such as nuclear physics and protein crystallography using neutrons. In these research activities, Korean groups are playing major roles under a strong support from Korean government. Especially, in 2010, Center for Korean J-PARC Users (CKorJ-PARC) is established and Memorandum of Collaboration was concluded between J-PARC. The field of nuclear and hadron physics is not an exception – in this talk, I will introduce activities and contributions of Korean groups to the researches in J-PARC. I will also show how Korean groups are collaborating with Japanese institutes including Tohoku University.
Feb 17 Parallel Session - A Talk-07 A chirality switching device designed with transformation optics
$ Yuan Shen, Kun Ding , Wujiong Sun, and Lei Zhou State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai, 200433, China
How to switch the chirality is our dreams due to the importance of it which originates from asymmetric synthesis[1]. It is not easy to achieve this because the structure needs to be modified. However people can use optical ways to change the chirality of certain objects effectively, for example a mirror transforms a right-handedness object to a left-handedness image. In recent years the propose of Transformation Optics has provided a convenient way to do this. The idea is to first optically cancel an object with complementary medium and then project an illusion of different object through some restoring medium. While in principle one can employ this theory to design a chirality-switching device, such an approach suffers the limitations that the objects hidden inside the device must be transparent. In viewing these previous effects, we find it still highly challenging to design a chirality-switching device. So in this paper based on transformation optics theory[2–4], we designed a chirality switching device, such that an object hidden inside would exhibit a reversed chirality (i.e., from left-handedness to right-handedness) for an observer at the far field. Distinct from a perfect mirror which also creates a chirality-reversed image, our device makes the
| 31 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” original object completely invisible to the far field observer. Numerical simulations are employed to demonstrate the functionalities of the designed devices in both two-and three-dimensional spaces[5]. $ Email: [email protected] [1] G. Q. Lin, Y. M. Li and A. S. C. Chan, Principles and Applications of Asymmetric Synthesis, (John Wiley & Sons, New York, 2001). [2] U. Leonhardt, Science 312, 1777-1780 (2006); J. B. Pendry, D. Schurig, and D. R. Smith, ibid. 312, 1780-1782 (2006). [3] U. Leonhardt and T. G. Philbin, Progress in Optics, (Elsevier, Amsterdam, 2009), Vol. 53, Chap. 2; H. Y. Chen, C. T. Chan and P. Sheng, Nat. Mater. 9, 387-396 (2010). [4] Luzi Bergamin, Phys. Rev. A 80, 063835 (2009). [5] Yuan Shen, Kun Ding, Wujiong Sun, and Lei Zhou, Opt. Express 18(20), 21419 (2010).
Talk-08 Electronic Properties of Hydrogenated Quasi-Free-Standing Graphene
Danny Haberer IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany e-mail: [email protected]
Regarding the application of graphene in future electronic devices, chemical functionalization is one of the key strategies to tailor the electronic properties of graphene. We have carried out functionalization of CVD grown graphene monolayers with alkali and hydrogen atoms. This allows for tuning the energy bandgap as well as the electron concentration independently, which is crucial for device applications. The chemical bonding and the concentrations of the adsorbed H-atoms are determined with high accuracy using core level and angle-resolved photoemission spectroscopies (ARPES). We employ ARPES to access the electron-phonon coupling in n-doped graphene and further demonstrate that a peculiar localized state arises when n-doped quasi-free-standing graphene is functionalized with atomic hydrogen.
Talk-09 Onion structures induced by hydrophilic and hydrophobic ions in water-oil mixtures
Katsuhiko Sato Department of Physics, Tohoku University Abstract: The phase separation behavior of two component mixtures, such as water-organic solvent (oil) mixtures, has been well investigated and is well known. In those systems, as usual, a macrophase separation occurs, i.e., the system separates into two macroscopic domains when the temperature
32 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium changes (usually to lower temperatures). In addition, three component systems such as water-oil-salt mixtures have been investigated and the effects of addition of salts to water-oil mixtures have been discussed. Recently, some interesting experiment was performed by Sadakane et al. [1], where some special salt was used. In usual cases salts are hydrophilic, that is, they are decomposed into hydrophilic cations and anions in the solvent. However, the salt Sadakane used is decomposed into "hydrophilic" cation and "hydrophobic" anion (which are sometimes called "antagonistic ions") in the solvent. This type of salt, roughly speaking, plays the same role as that of surfactants in water-oil mixtures, because the Coulomb interaction between hydrophilic cations and hydrophobic anions behaves like a chain connecting them. Thus, as in the surfactant systems, the antagonistic ion system shows various microphase separations. We focus our attention on an onion-like structure observed as an equilibrium state and we would like to approach its mechanism using a mean-field free energy functional analysis. [1] Sadakane et al., PRL 103, 167803 (2009).
Talk-10 Structures and compressibility of magnesium borohydride at high-pressure: A first-principles study
Jing Fan, Defang Duan, Lianchen Wang, Bingbing Liu, and Tian Cui1*
State key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People‘s Republic of China
Light element compounds such as magnesium borohydride have attracted much attention due to their potential applications in hydrogen storage. The determination and understanding of complex crystalline structures of magnesium borohydride under high pressure are still under debate. We found that the I41/amd and P-3m1 structures proposed recently are stable under high pressures which are all high pressure phases. It is noteworthy that the
I41/amd structure has high theoretical hydrogen volumetric density of 154g/L, which exceeds the DOE‘s ultimate goal of 70g/L. Our calculated enthalpies show that the I41/amd phase, which is a high-density phase, exists from 0.7 GPa to 6 GPa, and then transforms to the P-3m1 phase which is thermodynamically stable from 6 GPa to 10
GPa. The X-ray diffraction pattern of I41/amd phase is in satisfactory agreement with recent experimental results.
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Talk-11 The strong coupling between exciton and photon in ZnO whispering gallery (WG) cavity tuned by current induced thermal effect
Saifeng Zhang, Hongxing Dong, Liaoxin Sun, Wei Xie, Xuechu Shen, Zhanghai Chen State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
The strong coupling of exciton-photon (i. e. exciton polariton) has been observed in various semiconductor optical cavities [1-3] and has attracted tremendous attention in the past decades due to its potential in nano-photonics and polaritonics application. For practical device application, tunablity of the exciton-photon coupling is crucial. So far, several complex techniques such as cavity size control, external magnetic field etc., have been applied to tune the exciton-photon interaction. Here we report the tuning of strong coupling between exciton and photon by current induced thermal effect in a ZnO whispering gallery (WG) microcavity. In the experiments, we applied voltages across the ZnO microcavity. Using an angular resolved micro-photoluminescence spectrometer, we measured the dispersion of WG cavity polariton with the excitation of 371 nm laser under different voltages. A red shift of the lower polariton branch (LPB) was observed with increasing the voltage [Fig. 1 (a)]. When the voltage is 50 V, the redshift can reach up to 40~50 meV, which depends on the order of LPB. This large redshift is attributed to the thermal effect induced by the current in the ZnO micro-rod. With a simple heat conduction model, it is found that the thermal equilibrium can be established in a very short time (~ μs). The relationship of voltage versus temperature can be obtained by comparing the redshift to that of the thermal experiment heated by a hot plate. The temperature dependence of free exciton energy level, pure cavity mode and Rabi splitting are simultaneously considered in the fitting process. As a result, one can get the temperature dependence of LPB [Fig. 1 (b)]. It is also found that the strong coupling is preserved up to a very high temperature (~ 538 K), much higher than the reported one (~ 410 K) and close to the predicted maximum value of 610 K [2] [4]. Our results show opportunity for its optoelectrical application like wavelength-tunable polariton light emitting devices at or above room temperature.
Fig. 1 (a) the redshift of LPBs (different order with polarization TE or TM) increasing with the voltage (b) the
34 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium redshift of LPB (order of 49 with TE polarization), exciton level and pure cavity mode versus temperature
[1] Lambert K. van Vugt et al., Phys. Rev. Lett. 97, 147401 (2006). [2] Chris Sturm et al., New J. Phys. 11, 073044 (2009). [3] Liaoxin Sun et al., Phys. Rev. Lett. 100, 156403 (2008). [4] S F Chichibu et al., Semicond. Sci. Technol. 20, S67 (2005).
Talk-12
Feb 17 Parallel Session - B Talk-13 Status of Reactor Neutrino Oscillation and Geo Neutrino Measurement in KamLAND
Itaru Shimizu Research Center for Neutrino Science, Tohoku University Abstract: The KamLAND experiment searched for the oscillation of anti-neutrinos emitted from distant nuclear reactors. We observed the reactor anti-neutrino spectral distortion, which was a piece of evidence of neutrino oscillations. In 4,126 ton-year data-set, the neutrino mass-square difference was precisely measured to within 2.7% owing to their clear spectral distortion. We newly presented a global three flavor oscillation analysis, incorporating the solar,
CHOOZ, atmospheric, and accelerator data, and found a non-zero value of θ13 is suggested, but only at 79% C.L. KamLAND has the sensitivity to geologically produced anti-neutrinos from the decay of U and Th. This geo neutrino measurement will provide us a unique method to investigate the interior of the Earth. Earth composition models typically predict 16 TW radiogenic heat production from 238U and 232Th, contributing approximately half of the total heat dissipation rate from the Earth‘s surface, indicating the secular cooling of the Earth. Such models can be directly tested by the geo neutrino measurement in KamLAND. In this presentation, the status of the reactor and geo anti-neutrino measurement in KamLAND will be reported.
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Talk-14 KamLAND-Zen for the Neutrino-less Double Beta Decay of 136Xe
Junpei Shirai Research Center for Neutrino Science, Tohoku University Abstract: Neutrinos are fundamental particles but unlike other particles the masses are extraordinary small and only left-handed neutrinos and right-handed antineutrinos are found. The peculiar properties of neutrinos are not understood in the framework of the standard model of particle physics. Since electrically neutral, neutrinos can be antineutrinos by themselves, which are called Majorana particles. If neutrinos are Majorana particles, neutrino-less double beta (0νββ) decay, A(Z)→A(Z+2)+2e-, can take place for nuclei which can decay through the double-beta decay process, A(Z)→A(Z+2)+2e-+2ν. The decay rate would provide absolute scale and hierarchy of neutrino masses. Therefore, the study would provide new information beyond the standard model to tackle the mechanism of the smallness of the neutrino masses and matter-antimatter mystery of our world. There has been no accepted evidence for 0νββdecay to date mainly due to the small quantity (O(10)kg) of prepared nuclei and/or backgrounds from environmental radioactivity in the previous experiments. There are several ongoing and planned experiments with improved sensitivities to the neutrino mass down to O(10)meV in competition worldwide. KamLAND group is preparing a new project KamLAND-Zen to make a high sensitive search for 0νββdecay with a large amount of enriched 136Xe nuclei of 400kg by using the ultra-low background facility of the detector and putting a new mini-balloon filled with 136Xe dissolved liquid scintillator. In the presentation status of 0νββstudies and the current activities of KamLAND-Zen will be reported.
Talk-15 Sparticle Spectrum of Large Volume Compactification
Chang sub Shin KAIST, Korea Abstract We examine the large volume compactification of Type IIB string theory or its F theory limit and the associated supersymmetry breakdown and soft terms. It is crucial to incorporate the loop-induced moduli mixing, originating from radiative corrections to the Kahler potential. We show that in the presence of moduli mixing, soft scalar masses generically receive a D-term contribution of the order of the gravitino mass m_{3/2} when the visible sector cycle is stabilized by the D-term potential of an anomalous U(1) gauge symmetry, while the moduli-mediated gaugino masses and A-parameters tend to be of the order of m_{3/2}/8pi^2. It is noticed also that a too large moduli mixing can destabilize the large volume solution by making it a saddle point.
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Talk-16 Natural Supersymmetric signal at the LHC
Masaki Asano Department of Physics, Tohoku University Abstract: If the minimal supersymmetric standard model is the solution to the hierarchy problem, the scalar top quark and the Higgsino should weigh around the electroweak scale such as 200 GeV. A low messenger scale, which results in a light gravitino, is also suggested to suppress the quantum corrections to the Higgs mass parameters. The rest of the particles are useless for naturalizing the electroweak symmetry breaking, and therefore can be as heavy as a few TeV. Thus the minimal model for natural supersymmetry is a system with scalar top quark/Higgsino/gravitino. In such a case, the LHC signatures are quite different from the conventional studies. We discuss the discovery potential and methods for the new particle mass measurements. This scenario will be discovered/excluded quite soon at the LHC.
Talk-17
Hypernuclear γ-ray spectroscopy with Hyperball-J at J-PARC
Takeshi Koike, N. Chiga, F. Hiruma, R. Honda, K. Hosomi, Y. Matsumoto, K. Miwa, K. Shirotori, K. Sugihara, A. Sasaki, H. Tamura, M. Ukai, T. Wang, K. Yagi, T. Yamamoto, and Y. Yonemoto Department of Physics, Tohoku University Abstract: A new Ge detector array dedicated to gamma-ray spectroscopy of hypernuclei with a strangeness degree of freedom has nearly been constructed. This array named Hyperball-J will be installed as soon as this fall at the K1.8 beam line of J-PARC for the gamma-ray spectroscopy of light lambda
4 19 hypernuclei such as LHe and Fin its inaugural run. In this presentation, the present status of Hyperball-J will be reported. In addition, the recent theoretical results born out of collaboration with the theory group at Tohoku will be introduced.
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Talk-18 First Time Galactic Archaeology
Mikito Tanaka Astronomical Institute, Tohoku University
In this conference, we generally introduce Galactic Archaeology (hereafter GA) and briefly present our astronomical studies based on the GA technique. Individual stars that widely spread in a stellar halo around a galaxy, which is the oldest component in the universe, have maintained past information of the host galaxy. Therefore, we are able to understand how a galaxy formed by closely investigating old halo stars in galaxies that are near enough to resolve the stellar populations with current optical/infrared telescopes. Then, we call such research field GA. In accordance with GA technique, we investigate the stellar halos of nearby spiral galaxies such as the Andromeda galaxy and NGC55, to reveal how and when the galaxies formed. We have observed the halos with the wide-field imager, Suprime-Cam, installed on Subaru telescope and have found that there are some inhomogeneous stellar overdense substructures in the halos. It suggests that the galaxies have hierarchically formed through many merging events with smaller dwarf galaxies than the host galaxies. Furthermore, we discuss the global structures of the stellar halos of the galaxies, based on stellar density, metallicity and age of the old stellar populations.
Feb 17 Parallel Session - C Talk-19 On the discrete coupled Hirota equation
Hai-qiong Zhao Department of Mathematics, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, P.R. China Abstract: In this talk, we will discuss the discrete coupled Hirota equation which is a hybrid of the discrete nonlinear Schrödinger equation and the discrete mKdV equation. By using Hirota direct method, explicit solutions to the discrete equation are constructed. The dynamical properties of these solutions are discussed.
38 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Talk-20 Explicit solutions to a semidiscrete integrable equation
Tong Zhou Department of Mathematics, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, P.R. China Abstract: In this talk, we aim to construct the Darboux transformation and explicit solutions for a semidiscrete integrable equation introduced by Suris. Analysis of properties of the solutions shows that the obtained explicit solutions for this discrete integrable system possess new dynamical features which are different from the ones of continuous integrable systems.
Talk-21 Convexity breaking of the free Boundary for porous medium equations
Kazuhiro Ishige Mathematical Institute, Tohoku University Abstract: We investigate the preservation of convexity of the free boundary by the solutions of the porous medium equation. We prove that starting with an initial datum sharing some kind of sub-optimal concavity property, the convexity of the positivity set can be lost in a short time. This is a joint work with Professor Paolo Salani.
Talk-22 Kagaku and rigaku: a philosophical perspective of “science”
LAM Wing-keung Centre for Religious and Spirituality Education The Hong Kong Institute of Education Abstract This paper attempts to study the ―Japanese‖ translation of ―science‖ from a philosophical perspective. As is well known, there are basically two translations of ―science‖ in Japanese, namely, kagaku 科学 and rigaku 理学, including those given by Inoue Tetsujirō. The former seems to be two ideographs borrowed from a Chinese term, kejuzhidu 科舉制度, which carries the meaning of a civil examination on a or certain ―subject(s)‖, whereas the latter entails a broader sense, that is, neither does it point to a particular category of knowledge, nor refers to a ―subject‖. It somewhat indicates to a kind of universal or ultimate knowledge. Etymologically, the word ―science‖ means ―knowledge‖, which indeed does not point to a particular category, discipline or field, including ―natural science‖, ―material science‖, ―life science‖ and so on. This may help us understand why Nakae Chōmin claimed that ―science‖ can be translated as ―rigaku 理学‖, as it does not merely signify ―natural science‖, but also points to
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―philosophy‖, something that is not confined to a particular category of ―knowledge‖. Nowadays, ―Faculty of Science‖ in Japan is widely translated as ―rigakubu 理学部‖ instead of ―kagakubu 科学部‖. Why and how would the translation be settled as such? Does it mean that ―science‖ is perceived and prescribed something other than a particular discipline? If so, one of connotations for ―scienceweb‖ may consider embracing the webbing of ―science‖ with ―philosophy‖. For both are inquiring into the ri 理 with a broader or even an ultimate sense, rather than confining it to a particular category or narrow sense of ―knowledge‖.
Talk-23 Removing the fence between science and liberal arts - General education and its promise
Cheung Ching-yuen Chinese University of Hong Kong Abstract The aim of the Scienceweb and this international symposium is to explore new science frontiers through ―weaving science web beyond Particle-Matter hierarchy.‖ Here, philosophy is expected to remove the fence between science and liberal arts. Teaching liberal arts nowadays is becoming a difficult task, since tertiary education tends to set scientific research above education. How to remove the fence between science and liberal arts? How to teach liberal arts in university nowadays? In this presentation, I shall discuss some general education courses offered in Chinese University of Hong Kong, which can be seen as a possibility to remove the fence between science and liberal arts.
Feb 18 Plenary Session Talk-24 Monsters in Early Universe
Myungshin Im Seoul National University
About 0.5 billion years after the Big Bang, the first astronomical objects started appearing in the universe, ending the dark age of the universe and re-ionizing the inter-galactic medium. The beginning of the history of astronomical objects still remains as a poorly explored territory of observation astronomy. In this talk, I review the current observational efforts to unveil the first objects in order to understand the uncharted era of the universe. My review will focus on our current research activities of the most extreme objects in the early universe such as quasars housing super-massive black holes, energetic gamma ray bursts, and proto-clusters of galaxies, all of which no longer exist in the present-day universe but are effective tools for studying the early universe. I show that objects
40 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium were vigorously evolving when the universe was young as expected, but there exist several aspects in the observed properties of these monstrous objects which are difficult to explain with our theoretical models of the universe.
Talk-25 Integrability of the semidiscrete systems
Zuo-nong Zhu Department of Mathematics, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, P.R. China Abstract: In this talk, we will review the topic ― integrability of the semidiscrete systems (where "semidiscrete" means that the system is discrete in the space variable and continuous in time) which including the Lax pairs, the Darboux transformation, soliton solutions, the Hamiltonian structures and conservation laws for the semidiscrete integrable systems. We will report a new semidiscrete coupled mKdV system. The Lax pairs, the Darboux transformation, soliton solutions and conservation laws for the coupled semidiscrete mKdV system are discussed. The coupled mKdV theory is reconstructed through the continuous limits of corresponding theory for the new semidiscrete mKdV system.
Talk-26 Search for Fourth Generation Quarks at CMS
Kai-Feng Chen National Taiwan University
The Standard Model with three generations of quarks describes remarkably well all particle phenomena observed to date. Although adding a fourth generation of massive fermions is an obvious extension of the model, it became less popular ever since the limit on light neutrino flavors, and the precise measurements on the electroweak parameters, seem to disfavor such a possibility. However, indirect limits can never replace direct search for heavy particles. We present the results of a search for the heavy bottom-like fourth generation quark using the CMS detector in pp collisions of the Large Hadron Collider.
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Talk-27 Single Semiconductor Nanostructures for Quantum Photonics Applications
Wen-Hao Chang Department of Electrophysics, National Chiao Tung University, Hsinchu, 300 Taiwan *E-mail:[email protected], Phone: +886-3-5712121 ext.56111, Fax: 886-3-5725230
Single semiconductor nanostructures coupled to a monolithic microcavity have proven to be an ideal source of single photons for quantum cryptography. In this talk, I will give a review of our recent studies on three kinds of single nanostructures: quantum dots, quantum rings and quantum dots in nanowires, as well as their incorporation with microcavities. In the first part, I will present our studies based magneto-microphotoluminescence spectroscopy, which gives deep insights into the wave functions of excitons confined in single semiconductor nanostructures. The diamagnetic properties of different exciton complexes, such as bi-excitons and trions, and their interplay with the inter-particle Coulomb interactions in single nanostructures will be elucidated. Recent advances in the tuning of exciton energy and fine structures using external stress will also be presented. In the second part, I will talk about how to build a photonic molecule formed by two adjacent microdisk microcavities and show how to achieve strong coupling between cavity photons of different microcavities. The highly flexible and controllable photonic-molecule systems provide a possible route for coupling of single quantum dots in different microcavities mediated by the strong photon-field coupling. References: [1] M.-F. Tsai, H. Lin, C.-H. Lin, S.-D. Lin, S.-Y. Wang, S.-J. Cheng, M.-C. Lee, W.-H. Chang, Phys. Rev. Lett. 101, 267402 (2008). [2] T.-C. Lin, C.-H. Lin, H.-S. Ling, Y.-J. Fu, W.-H. Chang, S.-D. Lin, C.-P. Lee, Phys. Rev. B 80, 081304(R) (2009) [3] Y. J. Fu, S. D. Lin, M. F. Tsai H. Lin, C. H. Lin, S. Y. Wang, S. J. Cheng, and W.-H. Chang, Phys. Rev. B 81, 113307 (2009) [4] W.-H. Chang, W.-Y. Chen, H.-S. Chang, T. M. Hsu, T.-P. Hsieh and J.-I. Chyi, Phys. Rev. Lett. 96, 117401 (2006) [5] H. S. Chang, W. Y. Chen, T. M. Hsu, T. P. Hsieh, J. I. Chyi, and W.-H. Chang, Appl. Phys. Lett. 94, 163111 (2009).
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Talk-28 Controlled Synthesis of Low-dimensional Structures and Their Properties: Nanotube, Graphene, and Atomic wire on Si Surface
Chong-Yun Park Department of Physics & Center for Nanotubes and Nanostructured Composites (CNNC), Sungkyunkwan University, Suwon 440-746, Republic of Korea
For several decades, interests in science and technology have been moved to low-dimensional (low-D) systems, which are certainly distinct from three-D one. Carbon nanotube (CNT) has been one of the most interesting 1-D materials, and graphene is the hottest 2-D one in the present time. These low-D systems exhibit several exotic properties, such as ballistic transport, chiral quantum Hall effect, Klein paradox, etc. To understand these phenomena and fabricate new low-D structure, new approaches should be introduced. In this research, we investigated several novel approaches on synthesis and modification of the representative low-D systems, such as CNT, graphene, and atomic wire on Si surface. Diameter and bandgap controlled synthesis of single-walled CNT was successfully accomplished via controlling the Al2O3 support layer and the diffusion and evaporation of Fe catalyst. Graphene was synthesized on Ni substrate at extremely low temperature of 550 oC using microwave plasma enhanced chemical vapor deposition. A new growth method for wide-terrace epitaxial graphene was established by controlling the pressure and temperature, resulted in modification of its properties. The mechanism and atomic structure of Indium-induced triple-period atomic wire on Si(557) system was investigated.
Talk-29 Structural studies on carbon nanostrucutured materials under high pressure
Bingbing Liu State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China E-mail: [email protected].
The structural evolution for carbon nanostructures under high pressure is an important topic, which can not only provide information on the stability and phase transitions under compression, but also help us to produce novel carbon nanostructures which are hardly obtained at normal conditions. In this presentation, we present our recent study on the high pressure-induced polymerization or phase transitions for several typical materials in this interesting cabon family, including single-walled nanotubes (SWNTS), C60 inside SWNTs (C60@SWNTS, peapods),
C60 fullerene nanocrystals and hydrogenated fullerenes, obtained by using visible and near infrared Raman scattering and Infrared absorption spectroscopies under high pressure.
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Talk-30 Electronic and Magnetic Properties of Transition-Metal Oxides Probed with X-ray Spectroscopy
Di-Jing Huang National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
In condensed-matter physics, electronic and magnetic properties of correlated-electron compounds such as transition-metal oxides are important subjects. As the magnetic and transport properties are closely connected to the interplay among spin, orbital and charge degrees of freedom, there have been intense efforts to clarify the microscopic mechanisms giving rise to such exotic phenomena. For example, magnetic transitions are coupled to ferroelectric transitions of multiferroics. As another example, the electronic phase at the interface of a heterostructure often differs from those of bulks. Here we will present measurements of magnetic X-ray scattering and hard X-ray photoemission to discuss magnetic transitions of multiferroics and interfacial electronic properties a superlattice such as LaAlO3/SrTiO3.
Feb 18 Interdisciplinary Research Session Talk-31 Acceleration of quantum dynamics: Ideal manipulation of quantum states
Shumpei Masuda Department of Physics,Tohoku University Email: [email protected]
Speed is a very important factor for human beings. Manufacturing products (e.g., TVs, cars, plants, etc.) and moving materials from one place to another place in a shorter time are of fundamental interest, and the pursuit of speed has been developing technologies in various fields. Smallness and fineness are also important factors for science and technologies. Nowadays we can manipulate even individual atoms. It would be meaningful to consider the acceleration of quantum dynamics for further development of technologies and for manufacturing purposes. In this talk I show the fast-forward theory which gives a method to accelerate quantum dynamics and applications of the theory. The acceleration of quantum adiabatic dynamics is also shown. The fast-forward theory makes it possible to generate the final (target) quantum states in any finite time while it takes infinite time to obtain the final states in original adiabatic dynamics.
44 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Talk-32 Asymptotic profile of the solutions for nonlinear damped beam equations
Hiroshi Takeda Mathematical Institute, Tohoku University
Abstract: We consider the Cauchy problem for nonlinear damped beam equations with small initial data. We shall prove a global existence of a small solution for the equation and also give an asymptotic profile of the solution. Our proof is based on the analysis for the fundamental solution of the linear damped beam equation.
Talk-33 Prospects and Status of Belle II experiment
Yoshiyuki Onuki Department of Physics, Tohoku University Abstract: The BelleII/SuperKEKB project had approved to start in 2010 by the MEXT, the Ministry of Education, Culture, Sports, Science and Technology in Japan as "Very Advanced Research Support Program". The construction had already started and will be completed within 2013 both the accelerator and detector. The experiment will start April, 2014. The prospects of physics, current status of the experiment and contribution from Tohoku university will be presented in this talk.
Talk-34 Lattice QCD study of hyperonic interactions
Hidekatsu Nemura Department of Physics, Tohoku University Abstract: Nuclear force is one of the fundamental problems in physics even though it has been recognized that quantum chromodynamics (QCD) is the theory of the strong interaction. Although nucleons are not true fundamental building blocks of atomic nuclei but compositions of quarks and gluons, the description of nuclei in terms of nucleonic degrees of freedom provides successful results. For example, modern nucleon-nucleon (NN) potentials together with three-nucleon forces have been used for precise calculations of light nuclei. The hyperon-nucleon (YN) and hyperon-hyperon (YY) interactions are fundamental inputs to study the properties of hypernuclei and the hyperonic matter inside the neutron stars. However, in contrast to the normal nuclear force, scattering experiments are either difficult or impossible due to the short life-time of hyperons. Phenomenological YN and YY potentials are not well constrained from experimental data. Under these circumstances, the lattice QCD could be a valuable theoretical tool to make a first-principle calculation of nuclear forces. Recently, a new approach to the NN
| 45 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” interaction from the lattice QCD has been proposed. In this approach, the nucleonic potential can be obtained from lattice QCD by measuring the Nambu-Bethe-Salpeter amplitude and the observables such as the phase shifts and the binding energies are calculated through the resultant potential. Especially, it seems a fascinating method for studying the hyperonic forces. The purpose of this contribution is to describe various hyperonic lattice QCD potentials, including not only physical baryonic potentials such as the Lambda-Nucleon potential but also generalized flavor representation potential in the 27, 8s, 10, 10, 8a-irreducible representations.
Feb 18 Plenary Session-A Talk-35 Thin Film of Topological Insulator
Dr. Hai-Zhou Lu Department of Physics, The University of Hong Kong Abstract: The topological insulator is one of the most exciting discoveries of condensed-matter physics in recent years. It originates from strong spin–orbit interaction, a relativistic effect in which electrons experience an effective magnetic field when moving in the lattice electric field. The spin–orbit coupling twists the topological nature of energy bands for some band insulators, leading to time-reversal protected metallic states around their boundaries. The boundary states, or, in the case of three-dimensional (3D) topological insulators, the surface states, have gapless Dirac dispersion as with one quarter of a graphene, and are expected to demonstrate a number of novel properties for potential applications in spintronics and quantum information. This talk presents our recent works on the solution and effective model for the newly fabricated topological insulators, thin films grown from 3D topological insulator materials [1, 2]. Many predicted features, such as the gapped Dirac hyperbolas due to coupling between opposite topological surfaces, the structure inversion asymmetry induced by Rashba-like band splitting, and asymmetric distributions of the surface states along the film growth direction, agree well with the recent angle-resolved photoemission spectra of bismuth selenide films [3, 4]. More importantly, by fitting experimental data with the effective model, a crossover from 3D to 2D topological insulators is confirmed as present in the bismuth selenide. Our works will provide guidance for future study of the electronic transport and optical properties of topological insulator films.
References: [1] Hai-Zhou Lu, Wen-Yu Shan, Wang Yao, Qian Niu, Shun-Qing Shen, Phys. Rev. B 81, 115407 (2010). [2] Wen-Yu Shan, Hai-Zhou Lu, Shun-Qing Shen, New Journal of Physics 12, 043048 (2010). [3] Yi Zhang, Ke He, Cui-Zu Chang, Can-Li Song, Li-Li Wang, Xi Chen, Jin-Feng Jia, Zhong Fang, Xi Dai, Wen-Yu Shan, Shun-Qing Shen, Qian Niu, Xiao-Liang Qi, Shou-Cheng Zhang, Xu-Cun Ma & Qi-Kun Xue, Nature Physics 6, 584 (2010). [4] Yusuke Sakamoto, Toru Hirahara, Hidetoshi Miyazaki, Shin-ichi Kimura, and Shuji Hasegawa, Phys. Rev. B
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81, 165432 (2010).
Talk-36 Single-crystalline polyhedral indium oxide optical resonators
Hongxing Dong, Liaoxin Sun, Shulin Sun, Wei Xie, Lei Zhou, Xuechu Shen, and Zhanghai Chen State Key Laboratory of Surface Physics and Department of Physics, Laboratory of advanced Materials, Fudan University, Shanghai 200433, China
Semiconductor microstructure optical resonators have attracted much attention due to their microscopic size, high quality factor Q, and low lasing threshold power.1-3 In a semiconductor optical resonator, the microstructure itself functions as both the gain medium and the optical microcavity. The morphology and size of the microcavity could greatly affect the energies and the type of the resonant modes. Three dimensional microstructures with flat facets may provide an efficient control of light field in three dimensions, which have been proposed and discussed theoretically by Wang in 2000.4 However, experimentally, these interesting microcrystals with high crystal quality and smooth surfaces are very limited in any optical materials, not to mention their applicaiton as optical cavities. In this paper, we report the synthesis of In2O3 polyhedral microcrystals, such as pentahedron, hendecahedron, octahedron, etc., and optical resonator characteristics of the polyhedrons. The single-crystal In2O3 polyhedrons with different morphologies were successfully fabricated by a simple chemical vapor depositon method. SEM and TEM studies have demonstrated that the single crystalline In2O3 polyhedrons with very smooth surfaces and regular geometrical shapes. Fabry-Pérot modes (FPMs) and bow-tie like modes were directly observed by measuring micro-photoluminescence in the visible spectral range at room temperature. Experimental results are in good agreement with full-wave mumerical simulations and can be well fitted with a plane wave interference model. Such these microcavities with high crystalline qualitiy may be good candidates for the development of optical caivity based devices.
(a, b) SEM images of single polyhedrons. (c) The photoluminescence spectrum showing FPMs from an individual
In2O3 polyhedron as shown in Fig. (a).
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References: 1. A. C. Tamboli, E. D. Haberer, et al., Nat. photonics 1, 61 (2006). 2. T. Nobis, E. M. Kaidashev, A. Rahm, et al., Phys. Rev. Lett. 93, 103903 (2004) 3. F. Qian, Y. Li, S. Gradecak, et al., Nat. Mater. 7, 701 (2008). 4. Z. L. Wang, J. Phys. Chem. B 104, 1153 (2000).
Talk-37 Excitonic fine structures in single self-assembled quantum dots under external magnetic and strain fields
Chia-Hsien Lin,1 Hsiang-Yu Chou,1 Chien-Chia Lin ,1 Sheng-Di Lin,2 and Wen-Hao Chang,1 1Department of Electrophysics, National Chiao Tung University, Hsinchu, 300 Taiwan 2Department of Electronic Engineering, National Chiao Tung University, Hsinchu, 300 Taiwan
Magneto-microphotoluminescence spectroscopy is a useful technique that can give deep insights into the wave functions of excitons confined in semiconductor nanostructures. Here, we will present our recent investigations of the diamagnetic properties of different exciton complexes in single InAs/GaAs quantum dots (QDs). Due to the different responses of inter-particle Coulomb interactions to the applied magnetic field, systematic differences in diamagnetic shifts of exciton (X), biexciton (XX) and trions (X+/X-) can be resolved. In particular, we observed a reversal in sign of the conventional diamagnetic shift for the case of X-. Such anomalous behaviors can be explained by the more expanded electron wave function after photon emissions due to the strong Coulomb attraction by the hole in its initial state. The relation between the electron confinements and the special paramagnetic regime will be discussed. We have also investigate the effect of external stress on QDs using the
Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) crystal as a piezoelectric transducer. By applying an electric field on the PMN-PT crystal, we can change the strains in the QDs and hence the excitonic fine structures.
Talk-38 Sum rule for optical conductivity of nonequilibrium state in strongly correlated electron system
Tatsuro Yuge Institute for International Advanced Interdisciplinary Research, Tohoku University Abstract: Optical conductivity is the response function which characterizes response of the current to an optical probe field. It is known that several sum rules for optical conductivity hold in equilibrium states. One of them has been widely used to analyze properties of electron systems, such as high-Tc superconductors.
48 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
In this talk, using a general model of the strongly correlated electron system (which includes the Hubbard model), I extend the sum rules to be valid in nonequilibrium states. I also discuss possible applications to experiments. Reference: A. Shimizu and T. Yuge, arXiv:1101.1585.
Talk-39
Growth and optical properties of ZnO:(Mn,Mg,Se) epilayers grown by plasma assisted molecular beam epitaxy
Yu-Lin Yang, K‟un-Feng Chien, Wei-Lun Hsu, and Wu-Ching Chou Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan Abstract
High quality Zn1-xMnxO and Zn1-yMgyO epilayers were grown on c-plane sapphire substrates by plasma assisted molecular beam epitaxy with Mn contents x=0~0.013 and Mg contents y=0~0.112 using ZnO and MgO as buffer layers. The full width at half maximum of the near band edge emission peaks for the low x and low y samples are very sharp and less than 10 meV. Furthermore, A and B excitons and their phonon replicas of ZnO0.997Se0.003 epilayer were clearly observed. The longitudinal optical (LO) phonon of ZnO0.997Se0.003 epilayer is 70 meV and is lower than that of ZnO (72 meV).
Feb 18 Parallel Session-B Talk-40 Black Hole Mass Measurements with Rest-frame Optical Quasar Spectra at 3 < z < 5
Hyunsung Jun Seoul National University
We present the results of rest-frame optical spectroscopy of quasars at 3 < z < 5 from the AKARI space telescope mission program QSONG (Quasar Spectroscopic Observation with NIR Grism). QSONG is an AKARI phase-3 mission program which utilizes the unique capability of spectroscopy at 2.5-5 microns, adequate for detecting redshifted Balmer lines. From the calculated emission line widths and luminosities, we report measurements of supermassive blackhole (BH) masses with well calibrated optical mass estimators. The observed maximum BH masses at this relatively high redshift, and discrepancy to SDSS CIV-based BH masses are discussed.
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Talk-41 Y-band Imaging of Extragalactic fields
Changsu Choi Seoul National University
Y-band is a passband that is centered at 1micron and has a width 0.1micron at Full Width at Half Maximum. It is becoming an important window for extragalactic study as a new wavelength region owing to recent CCD technology developments. We aimed to investigate the characteristics of celestial objects, provide photometric calibration data, and test the color-color diagram quasar candidate selection method from Y-band data. We carried out imaging observation of several extragalactic fields, brown dwarf, high redshift quasars and A0V standard star with Y-band filter at the Mt. Lemmon Optical Astronomy Observatory(LOAO) and the Maidanak Observatory. We performed number counts in Y-band imaging fields and found slopes consistent with previous I-band and J-band data. Also, we tested the usefulness of high redshift quasar (z>6) selection via i-z VS z-Y color-color diagram. The discrimination method between them with i-z VS z-Y color-color diagram shows that it is as effective as the i-Y VS Y-J color-color diagram diagram method which means we can search more effectively high redshift quasars with optical CCD installed at 1-m telescopes. This work has important meaning as the first Y-band imaging of extragalactic fields in optical CCD. We achieved the depth 1 mag deeper than the UKIRT Infrared Deep Sky Survey(UKIDSS) and carried out Y-band imaging in advance to the Panoramic Survey Telescope & Rapid Response System(Pan-STARRS) so that we can test their data for the completeness and check what kind of study is feasible in Y-band. Moreover this study have two significant meanings. One is that we can obtain Near Infra-Red band data points in addition to optical data without NIR detector instruments. Another one is that we can get the utmost of 1-m class telescopes by exploring a new wavelength window.
Talk-42 Reach of LCGT in a continuous gravitational wave search
Yousuke Itoh Astronomical Institute, Tohoku University Abstract: The Japanese government approved the Japanese gravitational wave detector plan called LCGT (Large Cryogenic Gravitational wave (GW) Telescope) in the last June. In collaboration with worldwide network of GW telescopes, it may open up a new window on the universe. Among the expected sources of GWs the most promising ones are Galactic pulsars since, most importantly, a follow-up observation is easy in principle for this type of GW sources. On the other hand, it is known that sensitivity of detectors for pulsar GWs are limited by computational cost. In this talk I will show how sensitivity becomes better as more computational power is available for LCGT. I also mention how the GW community overcome the above computational cost problem, namely by volunteer computing program (the Einstein@Home project).
50 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Talk-43 Equations of motion in General Relativity
Dirk Puetzfeld Astronomical Institute, Tohoku University
The derivation of the equations of motion of extended bodies represents a long-standing problem in the context of Einstein's theory of gravity. Even the description of the motion of (extended) testbodies is still subject to present day investigations. In this talk we provide a brief overview of the so-called 'problem of motion' in General Relativity, in particular we review some of the approximation schemes used in the context of this problem.
Feb 18 Parallel Session-C Talk-44 Time asymptotic decay of solutions for the Euler-Maxwell system
Yoshihiro Ueda Mathematical Institute, Tohoku University ABSTRACT We consider the large-time behavior of solutions to the initial value problem for the Euler-Maxwell system. This system verifies the decay property of the regularity-loss type. Under smallness condition on the initial perturbation, we show that the solution to the problem exists globally in time and converges to the equilibrium state as time tends to infinity. This is based on a joint work with Shuichi Kawashima (Kyushu University) and Shu Wang (Beijing University of Technology).
Talk-45 p-Laplacian on finitely generated groups
Mamoru Tanaka Mathematical Institute, Tohoku University Abstract: Symmetry of a structure is represented by a group. For example, the fundamental group of a manifold is one of the descriptions of symmetry of the manifold. It is important to investigate properties of groups. In this talk, we considerabout properties of a finitely generated group, which has a geometric realization, the Cayley graph of the group.In particular, I will talk about a relation between some properties of a finitely generated group and the spectrum of the discrete p-Laplace operatoron the Cayley graph of the group. Here,the discrete p-Laplace operator is a Laplace operator on the ℓp space on the Cayley graph.
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Talk-46 Search for a permanent EDM using cold Fr atoms
K. Harada, M. Itoh, H. P. Yoshida, H. Kawamura, H. S. Nataraj, T. Hayamizu, A. Oikawa, T. Sato, M. Saito, S. Liu, Y. Sakemi, T. Aoki1, T. Murakami2, K. Imai2, A. Hatakeyama3, K. Hatanaka4, T. Wakasa5, M. Uchida6, and T. Shimizu7 Cyclotron and Radioisotope Center (CYRIC), Tohoku University, University of Tokyo1, Kyoto University2, Tokyo University of Agriculture and Technology3, RCNP Osaka University4, Kyusyu University5, Tokyo Institute of Technology6, Tohoku University7 Abstract: Searches for the permanent EDM of the fundamental particles have been of considerable interest in the recent decades. The EDMs hold valuable insights to various kinds of CP violation and the latter is the key for understanding Matter-Antimatter asymmetry in the Universe. In addition, EDMs serve as the direct signatures of the violation of Time-reversal symmetry. The heavy paramagnetic atoms are sensitive to the leptonic and semi-leptonic CP violation through the contributions arising from the intrinsic EDM of electron and the scalar－ pseudo-scalar electron-nucleus interactions. Francium (Fr) being a heavy alkali atom has a large enhancement factor of about 895. However, it posses an experimental challenge as there is no stable isotope of half life longer than a few minutes and it is radioactive. The production of Fr ions of intensity ～106 atoms/s has been achieved using a novel-type of the thermal ionizer at CYRIC, Tohoku University. As the laser cooling and trapping are the state-of-the-art techniques employed for the measurement of Fr EDM, we are developing the laser light sources and Magneto-optical trap apparatus. In this talk, the present status and the future prospects of the EDM experiment will be discussed.
Talk-47 Elastic Scattering of Protons with RI beams
Yohei Matsuda Physics, Assistant professor, Tohoku University Abstract In order to understand nuclear properties and describe nuclear reactions, it is important to study nuclear density distributions. Therefore it has been expected to measure proton elastic scattering on unstable nuclei. In particular, the incident energy, 300 MeV, is the most suitable because the proton has the longest mean free path in nuclei. For several years we have been developing a Recoil Proton Spectrometer (RPS), which consists of a solid hydrogen target and recoil proton detectors. And we have done the experiments at 300 MeV/u, which were the first at the energy region.
52 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
First of all, we focused on 9C. 9C has two characteristics. One is a candidate of a proton skin and the other is an experimental advantage that it is possible to select elastic scattering events by measuring charge of scattering particles. The obtained angular distribution is smoother than that of 12C. The present data agrees with that 9C has a proton skin. Next, we have done the experiments of 10,11C. We obtained systematic data of proton-rich C isotopes. From these data, decrease of the proton radius and increase of the neutron radius may be observed with the neutron number increase. Recently, we have done the experiments of medium-heavy nucleus. The measurements are interesting because it is closely connected with the evolution of the universe. As the first step, we have done the experiments of 66,70Ni. In my talk, I‘ll present the outline and the preliminary results of the above-mentioned experiments.
Feb 19 Plenary Session Talk-48 Ultra-Scaled III-V Green Quantum-Well Device for future high-speed and Beyond Moor‟s Law Logic Applications
Edward Yi. Chang National Chiao Tung University ABSTRACT: III-V Quantum-Well Field Effect (QWFET) Transistors have emerged as the most potential technology of choice for future Tera-Hz and next generation high-speed, low- voltage logic applications beyond Si-CMOS technology. In fact, the excellent RF-performance has been demonstrated using InAlAs/InxGa1-xAs HEMTs on InP substrate.
In this talk, nano-scale high performance InxGa1-xAs-channel QWFETs were fabricated and evaluated for RF and low-power logic applications. Superior drain-source current density of 1015 mA/mm was achieved with an extremely high transconductance (gm) of 1900 mS/mm when the drain voltage (VDS) was biased at 0.5 V, it indicated that the In-rich InxGa1-xAs-channel QWFETs can be biased at a low supply voltage to reduce overall dc power consumption, while maintaining relatively high current density and gm. The current gain cutoff frequency
(fT) and maximum oscillation frequency (fmax) of the device were extracted to be 393 GHz and 260 GHz at the low drain bias of 0.5 V, respectively. Moreover, the dc power dissipation was 5.8 mW when the device was biased at peak fT and fmax. Interestingly, an extremely high fT of 663 GHz was achieved for the InAs-channel QW transistor when the device was biased near the occurrence of impact ionization. For the logic characteristics, a low calculated gate delay (CV/I) of 0.54 psec was also achieved at 0.5 V drain bias due to the superior transport properties of the InAs channel. The Drain Induced Barrier Lowering (DIBL) and sub-threshold slope (SS) were calculated to be 200 mV/V and 115 mV/dec, respectively. Operations at different low operating voltages (VCC) ranging from 0.2 V to 0.5 V and higher VCC (> 0.5 V) with different total dc power dissipations for InxGa1-xAs devices will also be discussed in this talk, where possible tradeoffs between the performance and the dc power consumption can be made depending on the specific applications which need
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multiple VCC‘s at a given technology node. Compared to the silicon nMOSFET, the QWFETs exhibited better RF performance with lower DC power consumption which indicates the great potential of the III-V based device for high-speed and low-voltage digital applications in post-Si generations.
Talk-49
Magnetic nanostructure control by spin transfer
Hyun-Woo Lee Department of Physics, Pohang University of Science and Technology, Pohang, Kyungbuk, Korea
In ferromagnets, spins interact with each other through the spin-spin exchange interaction and become ordered at temperatures below the Curie temperature. Magnetic nanostructures are important in view of fundamental studies of magnetic properties, and may become a highly valuable platform of device applications provided high speed and high spatial resolution control of magnetic states becomes possible. In this respect, the spin transfer torque received great attention due to its potential ability towards unprecedented spatial and temporal control. The exchange interaction makes possible the transfer of the spin angular momentum between conduction electrons and local magnetization, and a series of experiments demonstrated electric control of magnetic nanostructures. This talk will review briefly the physics of the spin transfer torque and various spin transfer induced phenomena.
Talk-50
Talk-51 Exploring Physics Beyond the Standard Model of Particle Physics
Kiwoon Choi Korea Advanced Institute of Science and Technology -KAIST, Korea Abstract: I discuss the motivation and prospect for new physics beyond the standard model of lementary particle physics at the tera-electron-Volt energy scale which has just begun to be explored by the CERN Large Hadron Collider.
54 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Talk-52 The Negative Role of Empirical Stimulus in Theory Change: W. V. Quine and P. Feyerabend
Jeu-Jenq Yuann Professor of Philosophy, National Taiwan University, Taipei, Taiwan, ROC. e-mail: [email protected]
W. V. Quine (1908-2000) and P. Feyerabend (1924-1994) shared many essential ideas in both historical as well as methodological contexts. Both claimed to be descended from the Vienna Circle. Both inherited the result of the protocol statements debates taking place in the Circle and considered it a crucial part of their philosophies. Both resorted to something like conceptual schemes by which they interpreted all experiences, even the most commonplace ones (the idea of ―ontology‖ for Quine and the idea of ―theory‖ for Feyerabend). These similarities enlisted here do not intend to be exhaustive, yet they offer a picture that Quine and Feyerabend are analogous in their ideas. This helps us to see the significance of comparing them, especially the part that while Quine‘s philosophy of science is not entirely exempted from the tag of relativism, nor should Feyerabend be considered a prominent member of ―epistemological nihilism‖. The outcome of this comparison shows that while Quine offered in fact a ‗tolerant‘ philosophy of science, Feyerabend instead demonstrated his constructive view of science by proposing a pluralistic methodology. Having said so, their difference remains to be crucial to our concerns. When Quine proposed the core of science by referring to the sensory prediction established on the basis of stimulus meaning, Feyerabend diverged from Quine‘s approach by stressing the negative side of stimulation. It is mainly due to the negative role of empirical stimulus that Feyerabend could elaborate further his idea of pluralistic methodology. We finally in the end of this paper confirm the significance of this methodology as it exerts practical effectiveness on the expansion of empirical knowledge.
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Talk-53 High Efficiency Triple-Junction Solar Cells Employing Biomimetic Antireflective Structures.
Peichen Yu Optoelectronics department, National Chiao Tung University (NCTU)
Abstract: In this work, we demonstrate a thorough device design, fabrication, characterization, and analysis of biomimetic antireflective structures implemented on a Ga0.5In0.5P/GaAs/Ge triple-junction solar cell. The sub-wavelength structures are fabricated on a silicon nitride passivation layer using polystyrene nanosphere lithography followed by anisotropic etching. The fabricated structures enhance optical transmission in the ultraviolet wavelength range, compared to a conventional single-layer antireflective coating (ARC). The transmission improvement contributes to the enhanced photocurrent, which is also verified by the external quantum efficiency characterization of fabricated solar cells. Under one-sun illumination, the short-circuit current of a cell with a biomimetic structures is enhanced by 46.08% and 4.85% due to much improved optical transmission and current matching, compared to cells without an ARC and with a conventional ARC, respectively. Further optimizations of the biomimetic structures including the periodicity and etch depth are conducted by performing comprehensive calculations based on a rigorous couple-wave analysis method.
Talk-54 New high pressure phases of some typical molecular solids
Tian Cui State Key Lab of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China Email address: [email protected]
Extrahigh pressure causes extraordinary changes in materials by reducing interatomic distances and modifying the structures of phonons and electrons, which often results in new physical phenomena. High-pressure structures and phase transitions of the typical molecule systems such as CHBr3, H2S, N2/CN, HBr/HCl, AsH3, KH6 and group
IVA hydrides (SiH4, Si2H6, GeH4, SnH4 etc. ) are investigated extensively by means of first-principles density functional theory and extensive prediction strategies (molecular dynamics simulation, simulated annealing, soft mode phase transition, random structure-searching method and evolutionary methodology etc.). New high pressure phases are predicted and novel properties in these systems are observed.
56 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Abstracts of Poster Presentations
Po-01 Optical properties of metal-dielectric multilayer metamaterial
Aunuddin Syabba Vioktalamo Department of Physics, Tohoku University Abstract: Metallic dielectric multilayer structure is one type of artificial structure that exhibits exotic electromagnetic properties in optical regime. In this system effective permeability is not unity and s-polarization Brewster angle is observed. This is interesting phenomena since permeability of constituent material is essentially identical with permeability in vacuum. Our multilayer structure referred to as stratified metal dielectric metamaterial (SMDM) consist of 30 nm of silver sandwiched by 57 nm of alumina as a unit cell. This structure can be regarded as effective medium which has effective optical constant. As dielectric constant of silver we used experimental data in reference, while for alumina we assumed to be constant (2.7). Transfer matrix is applied in this structure from complex transmission and complex reflection data. In this presentation, the set optical constant of SMDM such as impedance, refractive index, permittivity, and permeability will be reported. The resonance is observed around 472 nm for calculation and experiment. The resonance occurs when the magnetic field is enhanced in the metal layer, where the electric field is suppressed.
Po-02 Coherent control of the selected excited state by two-color multipulse excitation
Kenta Abe Department of Physics, Tohoku University Abstract: The control of quantum phenomena with shaped laser pulses has been demonstrated successfully on a variety of chemical and physical systems. When the temporal spacing of the pulse train coincides with the period of a molecular vibration, a wave-packet involving the selected mode can be excited efficiently over other modes. However, the applied electronic states have been limited, because the resonance of the pump pulse is necessary for
| 57 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” the generation of the intense coherent vibrations. Two-color multipulse excitation is useful to control coherent vibrations in any excited state including the optically forbidden excited state. The first tunable prepump pulse resonantly excites the initial excited state (S2) to generate the target state (S1) (Fig.1(a)). The second shaped pulse can be independently tuned to control the selected vibration in the target state by impulsive stimulated Raman scattering (ISRS). In this study, the two-color multipulse excitation experiment by a mode-locked Ti:Sapphire laser system (Fig.1(b)) is applied to β-carotene and nile-blue.
(a) (b) Ti:Sapphire Laser System Shaped Pulse S2 ISRS NOPA Pulse Sample ~20 fs Shaper Prepump S1 SHG IR-OPA S0 SFG Tunable Prepump Pulse 400-2000 nm, ~100fs Fig. 1. (a) Coherent control of the optically-forbidden excited state. (b) Sketch of the two-color multipulse excitation setup.
Po-03 Analytical calculation of 3loop Master Integrals in perturbative QCD
Chihaya Anzai Department of Physics, Tohoku University Abstract:
The QCD potential VQCD, which is the ground state energy of state, is a fundamental quantity of QCD. It has been studied for a long time and used in many physical studies, such as to calculate decay rates, cross sections, and masses of heavy quarkonia. At short distance, VQCD is calculated by perturbative QCD. The one and two loop corrections to static QCD potential were computed in 1978 and 1999, respectively. Last year, the three loop correction was computed numerically by our group.
In perturbative QCD, VQCD is expressed in terms of a large number of loop integrals and there are two difficult steps in computing them: (i) to reduce many integrals to small set of integrals called MIs (Master Integrals), (ii) to evaluate all MIs. Up to now, step (ii) can be done only numerically. To calculate VQCD precisely, we are studying how to evaluate MIs analytically. MIs are momentum-space integrals and can be expressed in terms of Mellin-Barnes integrals, which can be converted to infinite series. Empirically it is known that these series can be reduced to zeta function, polylog function, and a few of multiple zeta values by employing the recurrence relations of the series, identities of 2F1, etc. Presently we are constructing an algorithm to reduce them generally and effectively.
58 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Po-04
Single Crystal Structure Analysis of Rb3H(SeO4)2 in the High-Temperature Phase by Neutron Diffraction
Y. Ishikawa, R. Kiyanagi, Y.Noda Institute of Multidisciplinary Research for Advanced Materials, Tohoku University Abstract:
It is known that the csystal of M3H(XO4)2 (M=K, Rb, Cs, X=S, Se) type undergo the ferroelastic phase transition at room temperature and the phase transition in superionic conductor above the ferroelastic phase transition point.
Rb3H(SeO4)2 undergoes the phase transition from ferroelastic phase (Space group : C2/c) to the phase of superionic conductor (Space group : R-3m) at Tc ~ 449K. The crystal structure of Rb3H(SeO4)2 in high-temperature phase is constructed by the SeO4 – H – SeO4 dimer with a hydrogen bond parallel to the a-b plane. The mechanism of an ionic conductivity has been pointed out the important role of proton moving by NMR measurement. However, it is difficult to analyze the contribution of hydrogen atoms in detail by X-ray diffraction. Since a neutron has the strong interaction with hydrogen atom, we study the single crystal structure analysis by neutron diffraction method. Figure 1 shows the nuclear density by Fourier analysis. The proton path is clearly observed from this nuclear distribution.
Fig 1. The nuclear density of Rb3H(SeO4)2 in high temperature phase by Fourier Analysis.
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Po-05 Study of the B→D*pi decay for CP violation measurement
Kennosuke Itagaki Department of Physics, Tohoku University Abstract: Study of time dependent decay rates for B→D*pi leads to the measurement of CP violation and extraction of the CP violation parameter sin(2phi1+phi3), where phi1 and phi3 are the angles of the Cabibbo-Kobayashi-Masukawa(CKM) unitary triangle. Using fully reconstructed D*pi event from the final Belle data sample, an updated analysis is ongoing. In this talk, the status of the sub decay mode D*→D0pi, D0→Kpi is reported.
Po-06 Determination of Superparticle Properties with Long-lived Stau at the LHC
Takumi Ito Department of Physics, Tohoku University Abstract: Behaviors of elementary particles are well described by the standard model of elementary particles (SM). Despite the great success of the SM, the theory is not thought to be the ultimate one because the SM can not answer why there exist two fundamental scales of particles, say, the electro-weak scale of 102 GeV (the scale of SM particles: electron, muon, quarks, ...) and the Planck scale of 1019 GeV (the scale of gravitational interaction). A solution might be that a new theory arises at near the electro-weak scale. For instance, if there are partner-particles of SM particles which have same interactions but spin different one-half, the electro-weak scale is protected from large quantum corrections because they will cancel out up to the Planck scale. This explanation seems to be natural: The theory having the partners mentioned above is known as supersymmetric standard model and partner-particles are called superparticles. No superparticles are observed so far, however, they should be discovered at the high-energy experiment like the LHC experiment if they really exist. At the LHC, we would like to not only discover them but determine their properties such as masses, spins, interactions and so on, in order to directly test the discussion above. We have studied the case in which the lightest tau-lepton partner, called stau, has a long-lifetime. When the stau lifetime is long enough to escape from the detector, superparticle production event is characteristic. Such a long-lived stau is predicted in several models, and this fact motivates us to study the case with the long-lived stau. I will discuss the determination of superparticle masses and their spins at the LHC, based on our recent works.
60 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Po-07 Crack patterns in nonlinear elastic films
Daiki Endo Department of Physics, Tohoku University Abstract: When a rubber balloon is ruptured, a crack propagates in the balloon and we can observe an oscillating pattern in fracture surface created by crack propagation. It is believed that this oscillating pattern is caused by biaxial tension, but we recently have discovered that the oscillating pattern is also observed in uniaxial tension. We have conducted an experiment of slow fracture of thin rubber films in uniaxial tension. As a result, two crack patterns are observed. One is an oscillating crack pattern, and the other is a straight crack pattern. The transition between the oscillating crack pattern and the straight crack pattern is observed in a strong nonlinear elastic region. This result shows that not only type of tension but also nonlinear elasticity of rubber plays an important role in the oscillating crack pattern formation. We have also conducted a computer simulation of fracture using a conventional linear elastic model and Neo-Hookean model. In this simulation, we can observe an oscillating pattern only in Neo-Hookean model. This result also indicates importance of nonlinear elasticity.
Po-08 Tunneling time of optical pulse in photonic band gap
Rihei Endo, Riichiro Saito Department of Physics, Tohoku University Abstract: Tunneling of a quantum particle through a potential barrier is one of the most striking feature in the quantum mechanics. A dynamic (or static) probability of the quantum tunneling has been observed for a number of various systems. In 1962, Hartman showed that the tunneling time of a quantum particle that penetrates potential barrier converge to a finite value with increasing barrier width. However, measurement of the tunneling electron was too difficult to detect a tiny probability of the quantum tunneling. In 1994, tunneling time of optical pulses through the photonic band gap of one dimensional multi-layered optical superlattice were measured precisely by Spielmann et al. They observed experimentally that the tunneling time converges to a finite value with increasing number of layers, whose result is similar to the Hartman effect in the quantum system.. We have studied tunneling time for an optical pulse to transmit in a photonic band gap of one dimensional multi-layered optical superlattice analytically. The analytical solution shows that the calculated tunneling time converges to a finite value with increasing number of layers. Because of the destructive interference of multi-reflected light in the superlattice, only the front part of the incident light can transmit in the photonic band gap, which is the reason of this effect. In this presentation, we will show the analytical solution of tunneling time.
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Po-09 E1 transition of 17Ne nucleus with core + 2-proton model
Tomohiro Oishi A, Kouichi Hagino A, Hiroyuki Sagawa B Department of Physics, Tohoku University A, Center for Mathematical Sciences, University of Aizu B Abstract: For the past some decades, nuclei far from the stability line, which decay with quite short lives and do not exist in the nature, have attracted lots of interests. Compared with the ordinary nuclei, those nuclei have some exotic features (for example, excessive numbers of proton or neutron) and suggest a new structure of physics. Properties of these nuclei play an important role not only in nuclear physics, but also in astrophysics, nuclear engineering, medical science and so on. In this presentation, we report the numerical result on E1 transition of 17Ne nucleus. This nucleus is a typical proton-excessive nucleus, and moreover, expected to have ―diproton correlation‖. The diprton correlation means the existence of a strong coupling between two valence protons in 17Ne, making diproton-like cluster which does not exist in vacuum. On the other hand, The E1 transition is a typical observable process invoked by electromagnetic interaction. To gain information on the diproton correlation, it is important to probe its influence upon E1 transition process.
Po-10 Deformation of Amphiphilic Membranes Containing Polymers
Yutaka Oya, Katsuhiko Sato and Toshihiro Kawakatsu Department of Physics, Tohoku University Abstract: Vesicle is a closed bilayer membrane which is composed of amphiphilic molecules. It is an interesting system because it can be a simple model of drug delivery system and endocytosis. Experimentally, it was observed that a unilayer amphiphilic membrane containing polymers deforms anisotropically. In order to clarify this anisotropic deformation, we study equilibrium shape of a vesicle induced by the presence of enclosed flexible polymers. To evaluate the total free energy of this system, it is necessary to calculate the bending elastic energy of the membrane, the conformation entropy of the polymers and their interactions. For this purpose, we combine phase field theory for the membrane and self-consistent field theory for the polymers. We simulated this model system and compared the stability of the prolate shape and the oblate shape of the vesicle depending on the chain length(N) and the packing ratio. Figure 1 shows the dependence of each component of the free energy difference between the prolate and the oblate shapes. Thus, a negative value means that the prolate shape is more stable than the oblate shape. Figure 1 shows that increasing N or decreasing packing ratio, which means that the polymer confinement inside the vesicle becomes stronger,the prolate shape tends to be more stable. It is also shown that a dominant
62 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium factor that determines this behavior is the contribution from the conformation entropy of the polymers. This result is in agreement with the result of a simple theoretical analysis on the same model system.
Figure1 ：Each contributions to the total free energy, i.e. bending elastic energy of vesicle(■), conformation entropy of polymer(●), mixing entropy of solvent(▲) and total free energy(◆). (a) Dependence on polymer length N and (b) dependence on packing ratio, where all other parameters are fixed.
Po-11 Controlled dephasing and shot noise studies in a Kondo-correlated parallel double quantum dot
Yuma Okazaki Department of Physics, Tohoku University
1) We investigate controlled dephasing of the orbital Kondo effect in a capacitively-coupled parallel double quantum dot (DQD) with a side-coupled quantum point contact (QPC). In this system, charge detection by a QPC localizes the state of the DQD electron in either dot and is expected to compete with the orbital Kondo effect that delocalizes the electron between the two dots. When a QPC bias is applied, we observe suppression of the orbital Kondo conductance roughly in proportion to the dephasing factor of the QPC detection. 2) We construct a low temperature shot noise measurement system. In this system, current noise spectrum is given from the following processes : current noise from a device is amplified with cryogenic and room-temperature pre-amplifiers, followed by fast Fourier transform for the digitized wave form. The performance of this system is verified by measuring thermal noise from a chip resistor.
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Po-12 Photoproduction of neutral kaon and lambda near the threshold region at ELPH
Akira Okuyama Department of Physics, Tohoku University Abstract: In late years, as a method to know the nucleus stats, hyperon which has a strange quark and strange quantum number is used. Because Hyperon does not accept the exclusiveness principle of Pauli, we can probe deep bound state at nucleus. Strangeness production is investigated with electromagnetic interaction well. However, the elementary processes of strangeness photoproduction are not well known. We are investigating the experiment of n(γ,K0)Λ reaction with deuteron in the threshold region at Research center for Electron Photon science (ELPH) in Tohoku university. We must identify four particles which decay from kaon and lambda particle to discuss kaon crosssection and lambda particle polarization. To identify four particles, we do three dimensional tracking with drift chamber. I am developing the analysis method of three dimensional track detector on near target (Vertex Drift Chamber, VDC). In this presentation, present status of analysis method of VDC tracking will be reported.
Po-13 Photo-induced effects in correlated electron system with spin-state degree of freedom
Yu Kanamori D3, Department of Physics, Tohoku University
In correlated electron systems, a variety of electronic phases are based on strong coupling between multi-degrees of freedom of electron, such as charge, spin and orbital. Photo-irradiation is one of powerful and controllable tools to disturb a fragile balance between several electronic states, and to invoke so-called photo-induced phase transition (PIPT). Recently, ultrafast photo-induced phenomena by applying femtosecond laser pulse have been measured in Perovskite cobalt oxide which is one of typical correlated electron systems. In this material, three kinds of spin-state, the low-spin (LS) state [S=0], the inter-mediate state [S=1], and the high-spin (HS) state [S=2], are candidates for a stable state in a Co ion. Spin-state transitions with changing temperature and hole-doping have been reported and these indicate the strong correlation between the spin-state and charge degrees of freedom. We study microscopic mechanisms of photo-induced spin-state transition in correlated electrons systems. We adopt the two-orbital Hubbard model as a minimal model to describe the spin-state degree of freedom. To introduce Hund‘s coupling and the energy difference between orbitals, both of the LS state in A0B2 configuration and the HS state in A1B1 can be a ground state. By using exact diagonalization method, electronic phase diagrams before and after photo-irradiation and optical spectra are obtained.
64 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
In this presentation, the microscopic picture of the photo-excited state and the origin of optical excitation structure are reported. We will discuss the correspondence between our results and experiments.
Po-14 The third generation precise hypernuclear spectroscopic experiment via (e,e‟K+) reaction at JLab Hall-C
Daisuke Kawama Department of Physics, Tohoku University Abstract: We carried out the third generation hypernuclear spectroscopic experiment via (e,e‘K+) reaction at Jefferson Lab (US) in 2009. The goal of the present experiment is the hypernuclear spectroscopy in the wide mass region up to A=52. For this purpose, we newly designed the splitter magnet (SPL) for the charge separation of e‘ and K+ and high resolution the scattered electron spectrometer (HES). The mass of hypernuclei is obtained by the missing mass calculated from the momentum of K+, e‘ and electron beam. Since the design value of energy resolution of electron beam (2.344 GeV/c) is less than 10-4 and the momentum resolution of both K+ spectrometer (HKS, central -4, the energy resolution of missing mass is estimated to be less than 400 keV. The experimental targets used for the experiment are CH2, H2O, 7 9 10 12 52 0 Li, Be, B, C and Cr. CH2 and H2 production whose masses are used for the missing mass calibration and the other targets are for the hypernuclear production. The data analysis flow is divided into 3 main branches; i) Particle tracking, ii) Kaon identification, iii) Momentum calibration. The particle tracking is carried out using the data of drift chambers in each arm. After that, the kaons are identified from background particles (proton and pion) using the time of flight information and the number of photoelectrons information obtained by aerogel and water cherencov counters. These analyses have been already optimized well. The momentum calibration is the most important part of the present analysis. The momentum vectors are reconstructed from the position and angle information obtained by tracking analysis using a function (F2T function) for each arms. These functions are initially obtained by MC simulation including calculated 3D magnetic field map. However, the accuracies of the maps are about the order of 10-2 which are not enough to achieve the aimed energy resolution. The calibration is carried out using the known mass of 0, as mentioned above, and run data of ―Sieve Slit‖ which is a tungsten plate with many holes to specify the particle passing position. The calibration procedure and current analysis status are mainly discussed in this presentation.
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Po-15 The double pion photoproduction on the deuteron
Chigusa Kimura Department of Physics, Tohoku University Abstract: The double pion photoproduction on the deuteron is very useful for our understanding of the photoabsorption of the bound nucleon, because the deuteron is the simplest compound nucleus. In the previous study, the double delta productions on the deuteron were observed. The cross-section of the double pions productions by the quesi-free process was found to be smaller than that on the proton. These results suggested the contribution of the non-quesi-free process is not small for the photoabsorption. We focus on these non-quesi-free processes. We carried out an experiment using a tagged photon beam in the energy range of 0.8-1.1 GeV at the Research Center for Electron Photon Science (ELPH) in 2010. The liquid hydrogen and deuterium target were used. The charged particles were detected by a magnetic spectrometer (NKS2). Now these data have been analyzing. In this presentation, the current status of analysis will be reported.
Po-16 Optical Rectification Effect in Asymmetric Photonic Crystal Slabs
Hiroyuki Kurosawa Department of Physics, Graduate School of Science, Tohoku University Abstract: Light has translational momentum and can transfer the momentum to materials in a number of ways. Optical rectification is one possible way. Optical rectification effect is one of the second order nonlinear effects, which produces DC polarization in a material without inversion symmetry. Recently nonlinear effects in artificial structures, i. e., metamaterials or photonic crystals, have gotten a lot of attention with the advancement of nanotechnology. And the optical rectification effect was also extended to metallic photonic crystal slabs by our group. We clarified the role of diffraction in optical rectification process, which is due to the symmetry breaking of diffraction efficiency, In my presentation it will be reported that optical rectification effect which is not due to the symmetry breaking of diffraction efficiency but due to the symmetry breaking of the DC polarization in the structure can be available when surface plasmon polariton is excited. Optical tornado effect, which produces vortex like momentum flow in asymmetric honeycomb structure, will also be discussed based on numerical study.
66 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Po-17 A Study of Large Scale Structures at High Redshifts with Lyman Break Galaxy Spectroscopic Survey around a Proto-cluster of Galaxies
Katsuki Kousai Physics, D3, Tohoku University Abstract We report our redshift survey of z~3 Lyman break galaxies ( LBGs ) . We observed LBGs spectra in proto-cluster region SSA22 ( 22:17:34, +00:15:04 ) 912 arcsec2. We have obtained spectral redshifts of 152 LBGs and found spike at z=3.1, 3.3 and 3.7 in the redshift distribution. SSA22 is a field in which Steidel et al discovered proto-cluster of LBGs at z=3.09 ( Steidel et al 1998 ) . They determined spectral redshifts of 99 LBGs at z~3 in 162 arcsec2 field. They found a critical spike at z=3.09 in the redshift distribution of LBGs. We have detected a lot of Lyman alpha emitters ( LAEs ) at z=3.09 in 912 arcsec2 field which contains the high density region discovered by Steidel et al, in our narrowband filter (NB497: band pass centered at 4977 Å, bandwidth of FWHM 77Å ) survey for LAEs with Subaru Prime Focus Camera to find a large scale structure of LAEs ( Hayashino et al 2004 ) . We can detected only z=3.06~3.12 LAEs in the narrow band imaging survey. However, the other redshift galaxy were not detected by this method. We also carried out LBG redshift survey in our LAE survey area. We observed z~3 LBG candidates in the field with ESO-VLT VIsible MultiObject Spectrograph ( VIMOS ) in 2006 and 2008. We identify spectral redshifts of 152 LBGs with Lyman alpha emission line ( 1216Åin rest-flame ) or metal absorption line ( Si II, O I, C II ( 1216Å, 1303Å, 1334Å in rest-flame ) etc ) . We drew redshift distribution of those LBGs. In our redshift distribution, we found spike not only at z=3.1 that was discovered by Steidel but also z=3.3 and 3.7. We also study spatial distribution of LBGs that is included those spikes. It seems that LBGs in each spikes are clustered in sky distribution of those LBGs In our poster, we report on the redshift distribution of 152 LBGs at z~3, the property of those density peaks that is found in the redshift distribution and the spatial distribution of LBGs.
Po-18 TiN-MKIDs for CMB Polarization observation
Kensuke Koga Department of Physics, Tohoku University Abstract: In the modern cosmology, it is thought that the inflation that space is beyond velocity of light before Big Bang in a short time, and expanded happened, and a lot of theories are suggested. However, experimental inspection is indispensable to understand a true phenomenon and build an ultimate elementary particle theory. One of the means of the effective observation inspecting such a theory is B mode polarization observation of cosmic microwave
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background (CMB). For the realization, a millimeter wave observation satellite called LiteBIRD is planned in Japan, and development of the super high sensitivity (NEP=10^-18W/√Hz) detector array (more than 1,000) of the frequency band of 60-250GHz is demanded as a focal plane detector. I push forward the research and development of the superconducting detectors called MKIDs (Microwave Kinetic Inductance Detectors) as one solution in response to this demand. MKIDs is the detector which used that the resonance frequency of the superconducting resonance circuit changes with emission incidence, and work as a detector of the high sensitivity by reading the change of the interchange characteristic (the amplitude, phase). And it is expected when readout is enabled at the same time of 1000 channel order by changing the resonance frequency of each pixel of the detector little by little. Now, I choose TiN among various reasons as materials of this detector and perform fundamental studies such as the evaluation of the superconducting transition temperature. In this poster, I report about the progress of the study.
Po-19 EELS and SXES studies of electronic structures of Zn-Mg-Zr alloys
Shogo Koshiya Department of Physics, Tohoku University Abstract: After the discovery of quasicrystals, great effort has been spent for understanding the presence of quasiperiodic structured materials. Recently, EELS and SXES experiments on Al-Si-Mn alloys showed the characteristic chemical shifts in quasicrystalline phase exist for Al and Si sites [1]. Those chemical shifts indicated a decrease of valence electron charge and implied an increase of covalency in Al-based quasicrystalline materials. However, there are few reports of chemical shifts about non-Al-based quasicrystalline alloys. Thus, it should be important to investigate the relation between a chemical shift and bonding nature of the quasicrystals not only for the Al-based ones but also for other quasicrystalline materials.
In this presentation, the chemical shift of Zn-Mg-Zr alloys of primitive icosahedral quasicrystal (P-QC) Zn83.5Mg9.5Zr7, face-centered icosahedral quasicrystal (F-QC) Zn75Mg18Zr6 and a 1/1-approximant of F-QC Zn77Mg19Zr4 phases were investigated.
68 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
For EELS measurements, a high energy-resolution EELS-TEM was used [2] and for SXES measurements, a SXES-TEM was used [3]. Those results show a presence of characteristic chemical shift in Zn-based quasicrystalline phase. Therefore, a chemical shift in quasicrystalline phases can be a common characteristic related to an increase of covalency in quasicrystal states. References: [1] S. Koshiya et al., Phil. Mag. (accepted). [2] S. Ohhashi, et al., Acta Mater. 57 (2009) 4727. [3] M. Mukai et al., Microsc. Microanal 12 (Supp 2) (2006) 1206. [4] M. Terauchi et al., J. Electron Microsc. 59 (2010) 251.
Po-20 Search for pentaquark at J-PARC K1.8 beam line
Kotaro Shirotori Department of Physics, Tohoku University
The pentaquark predicted by Diakonov et al. [1] has an unusual nature of quark contents of uudds and a narrow width. The understanding those exotic hadrons like the pentaquark plays an essential role to discriminate and improve the models of hadrons. The search for exotic hadrons is one of the important subjects in hadron physics. The observation of reported by SPring-8/LEPS[2] triggered the investigation of . Several experiments reported positive results immediately. On the other hand, negative results have been reported from several high-energy experiments with higher statistics. Thus, the confirmation of the existence (or non-existence) of the is crucially important, particularly by high statistics experiments in low energy region with hadronic reactions. The J-PARC E19 experiment was carried out at the J-PARC K1.8 beam line from October to November in 2010. This was the first experiment in the J-PARC hadron experimental facility. The experiment was proposed aiming to confirm the existence of using the p → K reaction by high-resolution spectroscopy. We measured the missing mass spectrum of the p → K reaction with the beam momentum of 1.92 GeV/c. The incident momentum of the pion was measured with the K1.8 beam line spectrometer, and the momentum of the kaons was measured with the SKS spectrometer (Fig. 1).The SKS spectrometer, which was previously used at KEK, was reconstructed for the J-PARC experiments with new detectors. In this presentation, the result of the J-PARC Figure 1: Schematic view of the experimental setup. E19 experiment is reported.
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[1] D. Diakonov, V. Petrov, M. Polyakov, Z. Phys. A 359, 305 (1997). [2] T. Nakano et al ., Phys. Rev. Lett. 91, 012002 (2003).
Po-21 Magnetism and superconductivity in noncentrosymmetric heavy-fermion
CeRhSi3
Tetsuya Sugawara Department of Physics, Tohoku University
Abstract:
CeRhSi3 is a noncentrosymmetric heavy-fermion pressure-induced superconductor discovered in 2005 by N. Kimura et al [1]. The superconductivity emerges above 0.2 GPa although the antiferromagnetic order persists up to 2.4 GPa.
We reported the temperature dependence of the upper-critical-field Hc2(T) along the tetragonal c-axis of CeRhSi3 at the last forum. Above 2.4 GPa, there is a magnetically induced phase which bends Hc2(T)-curve. Therefore, there are three types of superconductivity in CeRhSi3, namely, the one develops under (a) the antiferromagnetic phase, (b) the paramaginetic phase, (c) the magnetically induced phase. At the forum, we will report the features of each superconductivity and discuss the relation between magnetism and superconductivity. Reference [1] N. Kimura et al., Phys. Rev. Lett. 95 (2005) 247004.
Po-22 Study of baryon properties via π0η photoproduction
Koutaku Suzuki Department of Physics, Tohoku University Abstract We have been studying hadron properties via π0η photoproduction reactions at Research Center for Electron Photon Science, Tohoku University. Baryon resonances can be described as octet meson and octet baryon couplings. Recently, coupling properties of octet meson and decuplet baryon are calculated, and it predict a strong coupling between the η meson (octet meson) and the P33 Delta (decuplet baryon, it can decay into π0 and N). To investigate the resonance in more detail, we developed a large solid angle electro-magnetic calorimeter system, FOREST. It consists of three types of electromagnetic calorimeters and three plastic scintillator hodoscopes. One calorimeter located in a forward angular region is made up with 192 pure CsI crystals, the second one covering the polar angle from 30°to 100°comprises 252 lead scintillating fiber blocks, and the remaining calorimeter are built with 36 lead glass Cherenkov counters. The energy resolutions of pure CsI crystals, lead scintillating fiber
70 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium blocks, and lead glass Cherenkov counters are 2.4%, 7.2%, and 4.9%, respectively, for 1.0 GeV electrons. The plastic scintillator hodoscopes are placed in front of these calorimeters to distinguish a particle being charged or neutral. FOREST covers the solid angle of about 90% in total. Experiments for the π0η photoproduction reactions have been performed with FOREST. The result of the experiments will be introduced.
Po-23
Study of decay B->DK,D->KSK for the measurement of the CP-violating angle 3
Zenmei Suzuki Department of Physics, Tohoku University Abstract:
The current knowledge on the CP-violating angle 3 is dominated by the measurements from Dalitz analysis of
B->DK where D->KShh (h = K or ).
I report the first study of B->DK,D->KSK decay using the full data sample collected by Belle experiment at the
Upsilon(4S). The potential impact of this mode on 3 measurement is discussed.
Po-24 Ionic transport in supercooled liquid state of trehalose-water-lithium iodide
Reiji Takekawa Institute of Multidisciplinary Research for Advanced Materials, Tohoku University Abstract: Ionic conductivity of glass and liquid is characterized by the concept of "coupling and decoupling". In coupling system, all the constituent ions strongly couple with glass framework and show poor ionic conductivity in the glassy state. On the other hand, some ions decouple from glass framework to show ionic conductivity even in the glassy state, which is called as a decoupling system. In particular, so called "super ionic conductor glass", which has very high ionic conductivity is characterized by the large decoupling index value. LiI-6H2O solution is a good glass forming liquid. We have concluded that this system is also a coupling system. The coupling nature of this system is due to the strong coordination interaction between the lithium cation and the surrounding water molecules which have oxygen‘s lone pair electrons to coordinate the lithium ion as well as their hydrogen bonds to form long range random networks in the liquid state. Alternatively, some sort of sugars such as glycerol, succulose, maltose, trehalose etc. are known to have strong effect to enhance the glass forming ability of the aqueous solutions. We have tried to add a disaccharide of trehalose to the aqueous solution of LiI to increase the glass forming ability and decoupling index. The ternary system of trehalose-H2O-LiI has wide glass forming region. A large enhancement of the ionic conductivity up to 3 orders of magnitude is observed at Tg in this system LiI high concentration region. The enhancement of this conductivity is probably due to the decoupling of the lithium ion motion from the
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hydrogen-bond based glass networks composed of H2O and trehalose.
Po-25 Status of the Double Chooz experiment
TABATA Hiroshi Department of Physics, Tohoku University, D3 Abstract
Double Chooz experiment is a reactor neutrino experiment searching for last undefined neutrino mixing angle θ13. Double Chooz experiment uses 2 identical detectors to cancel systematic errors. These detectors are constructed two different distances from reactors. One detector, called far detector, locates 1.05 km far from the reactors, another detector, called near detector, locates 400 m from the cores. Far detector construction was finished in the 2 end of 2010. Detector commissioning is going on now. Sensitivity will reach sin (2θ13)~0.06 in 1.5 years after start of data taking. Near detector will start 2012 and data taking with 2 detectors will start. Using 3 years data with 2 detectors, sensitivity will reach to 0.03. This poster describes detector construction, accidental background study and commissioning data analysis.
Po-26 Nahm transformation and T-duality
Yoshiro Teshima Department of Physics, Tohoku University Abstract: Superstring theory is the most attractive theory as the unified theory including gravity. General relativistic theory, which is described in Riemannian geometry, is well known as a classical theory of gravity. However, if we quantize general relativistic theory, we cannot remove divergence. But in superstring theory, the closed string propagation is consistent with graviton propagation. And the open string corresponds to gauge fields, so superstring theory is the strongest candidate of the unified theory including gravity. However, the superstring theory is defined only perturbatively. To obtain nonperturbative definition, finding the background geometry is a effective way such as Riemannian geometry associated with general relativistic theory. Such geometry must have a T-duality. T-duality is the quantity that the circle with radius R is identical to the circle with radius /R. This quantity comes from the length of the string, so this is peculiar to string theory. So we have to know more about T-duality. On the other hand, Nahm transformation is a transformation which transforms the gauge theory on a torus to the gauge theory on a torus with the inverse radius. So Nahm transformation is said to be related to T-duality. We investigated the correspondence of Nahm transformation and T-duality.
72 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium
Po-27 Single Polymer Dynamics by Particle-Field Hybrid Models
Masatoshi Toda Department of Physics, Tohoku University Abstract: Since the pioneering works by Kirkwood, Rouse, and Zimm, an understanding of dynamics of a flexible polymer chain in dilute solutions has developed very much and most of its basic framework has been established. To our knowledge, however, the appropriate scope of application of these theoretical models was not checked sufficiently and self-entanglement effects on dynamics of a single polymer chain were not discussed much with a few exceptions. In order to make these obscure points clearer, we calculated dynamic properties, such as the mean square displacement (MSD), of a polymer chain by using particle-field hybrid models that we have developed. These hybrid models can treat a single polymer chain as one composed of discrete particles and the solvent part as a continuous field. In this presentation, we will report the details of the numerical results and discuss hydrodynamic and self-entanglement effects on chain dynamics.
Po-28 Charge dynamics in charge ordered system with frustrated geometrical lattice
Makoto Naka Department of Physics, Tohoku University Abstract: Electronic ferroelectricity is known as phenomena where the electric polarization is caused by the electronic charge order without inversion symmetry. This is seen in some transition metal oxides, e.g. LuFe2O4, and charge transfer organic salts. It is suggested from the theoretical works [1,2] that large charge fluctuation and frustration are responsible for the electric polarization. This charge fluctuation is expected to govern dynamical properties and external field effects. Actually, the relaxer like large dielectric fluctuation in some electronic ferroelectricity is observed. Motivated by these experimental and theoretical results, we study charge dynamics in charge ordered fermion system on the layered triangular lattice. We adopt the V-t model where the inter-site electron transfers and the inter-site Coulomb interactions are taken into account. We analyze this model by utilizing the exact diagonalization method and focus on effects of frustration in the charge dynamics. In the 3-fold charge ordered phase associated with the electric polarization, the optical conductivity shows multiple-peak structure in a wide energy range. In the non-polar 2-fold charge ordered phase, a precursor of the 3fold charge order appears in the low energy charge fluctuation around the phase boundary. [1] A. Nagano et al. Phys. Rev. Lett. 99 217202. [2] M. Naka et al. Phys. Rev. B. 77 224441.
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Po-29 Study of light hypernuclei with Stochastic Variational Method
Yoji Nakagawa Department of Physics, Tohoku University Abstract: An ordinary nucleus consists of protons and neutrons, which further consist of up and down quarks. It is known that a nucleus with a hyperon(s) containing a strange quark(s), which is called a hypernucleus, can have some different properties from the core nucleus. Especially, properties of light nuclei may be drastically changed. For instance, the 7 measured B(E2) value of ΛLi is three times smaller than the corresponding value of the core nucleus. This reduction of B(E2) value is interpreted as a shrinkage of the distance between α and deuteron cluster in 6Li. One of the current topics in modern nuclear physics is concerned about neutron-rich nuclei. First observation of a 10 neutron-rich Λ hypernucleus, ΛLi, was achieved in a KEK experiment. In the near future, neutron-rich Λ 6 9 hypernuclei, ΛH and ΛHe, will be produced in the J-PARC E10 experiment. Therefore, it is timely to study the property of light neutron-rich hypernuclei. In this presentation, I will show some calculated results for light hypernuclei by using the Stochastic Variational Method, which is one of the calculation methods to solve few-body bound-state problems with the comparable accuracy to other approaches.
Po-30 Ultrafast photoinduced melting of charge order in organic conductor
Hideki Nakaya Physics, D3, Tohoku University Abstract:
We investigated photoinduced insulator to metal transition (PIMT) in charge ordered (CO) insulator -(ET)2I3 (ET:bis(ethylenedithio)-tetrathiafulvalene) by using mid-infrared (IR) pump-probe [1-4] and near-IR pump-terahertz(THz) probe spectroscopy [5]. -(ET)2I3 is well known layered organic charge transfer complex exhibiting charge order below TCO (transition temperature to CO state=135 K). Figure 1 (a) shows that transient reflectivity (ΔR/R) spectra in mid-IR region (0.89 eV excitation, 0.1 mJ/cm2) at
20 K. The ΔR/R spectrum is analogous to differential reflectivity spectra (RM -RI)/RI (solid line), where RM and RI respectively represent the reflectivity of the metallic and CO phase. Such spectral coincides indicates the occurrence of the PIMT. Figure 1 (b) shows that transient absorption (OD) spectrum in THz region (0.89 eV excitation, 0.01 mJ/cm2) at
20 K(< 74 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium (a) 20 K, I =0.1mJ/cm2 (b) I =0.01mJ/cm2 0.2 ex ex 20 K (T< R 0 / OD R 0.2 Δ Δ -0.2 0.1 ps 0.1 (RM-RI)/RI (×0.45) 0 0 0.2 0.4 0.6 0.8 1 0 10 20 Photon Energy (eV) Photon Energy (meV) Figure 1 (a) Transient reflectivity (●:ΔR/R) observed for excitation intensity 0.1 mJ/cm2 at 20K and differential reflectivity (RM -RI)/RI (solid line)., (b) Transient absorption (ΔOD) spectra observed for 2 excitation intensity 0.01 mJ/cm at 20 K(< References [1] Iwai, Nakaya et al. Phys. Rev. Lett. 98, 097402 (2007) [2] Iwai, Nakaya et al. Phys. Rev. B 77, 125131 (2008) [3] Yamamoto et al. J. Phys. Soc. Jpn, 77, 074709(2008) [4] Kawakami et al. Phys. Rev. Lett. 105,246402 (2010) [5] Nakaya et al., Phys. Rev. B 81, 155111(2010). Po-31 Single-crystal structure analysis of spinel oxide FeV2O4 having orbital degree of freedom both in Fe and V ions Yoichi Nii Department of Physics, Tohoku University In transition metal oxides, the orbital degree of freedom plays an important role in their physical phenomena. It has been reported that FeV2O4 spinel oxide, which has orbital and spin degrees of freedom both in tetrahedral Fe2+(d6) sites and octahedral V3+(d2) sites, exhibits successive structural phase transitions (cubic—HT-tetra—HT-ortho—LT-tetra—LT-ortho). Moreover the second highest structural transition accompanies a ferrimagnetic transition. The origin of the phase transitions is supposed to be a cooperation and/or competition between the orbital and spin degrees of freedom both in Fe2+ and V3+ ions. In this study, we have determined the space group and atomic coordinate of each phase by a synchrotron x-ray single-crystal structure analysis. We also discuss the arrangements of Fe2+ and V3+ orbitals, assuming strong electron-lattice coupling | 75 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” Po-32 Photoproduction of the ω-meson on the proton near the threshold Ryo Hashimoto Department of Physics, Tohoku University Abstract: The ω-meson is one of the vector meson with spin parity 1- and a mass of 782.65 MeV. Study of near-threshold photoproduction of the ω-meson is interesting to search for new baryon resonances. Recently, the CLAS collaboration reported that a missing baryon state JP = 5/2+ contributes to ω-photoproduction. In case of φ-photoproduction, the SPring-8/LEPS collaboration stated that the anomaly of the cross section is observed near threshold region. A local maximum appeared around Eγ = 2 GeV. It is meaningful to confirm whether such a local peak exists or not for ω-photoproduction. The detailed cross section is desired, however there are a few experimental results of ω-photoproduction. The experiments were perfomed with a 4π EM calorimeter complex FOREST at the GeV-γ experimental hall in Laboratory of Nuclear Science (now, Research Center of Electron Photon Science). The bremsstrahlung photons with the energy of 750 – 1150 MeV are exposed to a cryogenic liquid H2/D2 target. A missing mass distribution of recoil protons is a good tool in identification of the ω-meson. A missing mass MX(p) is calculated through a formula 2 ini 2 MX(p) = (pγ + pp - pp) , ini where pγ , pp , pp are 4-momentum of incident γ, target proton, recoil proton, respectively. Pronounced peaks corresponding to the ω- and the η-meson are observed in measuring of their decay mode of π+π－π0. In this poster, the current status of analysis for ω-photoproduction will be reported. + - 0 Missing mass MX(p) for γp→π π π p reaction. The ω- and the η-meson peaks are clearly observed. 76 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium Po-33 Ground state phase diagram and fractional quantum Hall states of graphene in a high Landau level: A DMRG study Tatsuya Higashi Department of Physics, Tohoku University Abstract: Graphene, a single atomic layer of graphite, has a honeycomb lattice structure with two carbon atoms in a unit cell. Because carbon atoms form triangular sublattices A and B, the electron wave functions consist of two components labeled by A and B. In a perpendicular magnetic field, the wave functions at the n( )th Landau level (LL) of graphene consist of the wave functions of the conventional 2D systems with LL index n and n-1. Reflecting the form of the wave functions, the effective coulomb interaction between electrons at the nth LL of graphene is strongly modified from that of the conventional 2D systems, and it is a ―mixture‖ of the effective Coulomb interactions at the nth and n-1th LL of the conventional 2D systems. In the n=2 LL of conventional 2D systems, the charge density wave (CDW) states called stripes and bubbles are realized in the ground state. On the other hand, it has been suggested that incompressible quantum liquids exhibiting the fractional quantum Hall effect are realized at some fillings in the n=1 LL of conventional 2D systems. Thus, it is expected that the ground state phase diagram of the n=2 LL of graphene is more complicated due to the competition between incompressible quantum liquids and the CDW states. In the present study, the ground state of the n=2 LL of graphene is examined at various fillings by the density matrix renormalization group (DMRG) method on the torus geometry, and the ground state phase diagram is obtained. Po-34 Investigation of K0 Photoproduction near the Threshold Kenta Futatsukawa Department of Physics, Tohoku University Abstract: Kaon photoproduction plays an important role for the investigation of production mechanisms with the new degree of freedom "strangeness" thank to the well-known electromagnetic interaction. The high-quality measurement of the K and K0 production on the proton for not only differential cross sections but also polarization observables are published. However, the amplitudes of these reactions cannot even be interpreted in spite of the theoretical efforts. Therefore, the experimental data of various set such as for other isospin channels are awaited. We designed and constructed the neutral kaon spectrometers (NKS2) at the Research Center for Electron Photon Science, Tohoku University (ELPH) due to investigating the K0 channel. This channel is a unique because no charge in the initial and final states is involved. The differential and integral cross sections of the d→K0X and d→X reactions were obtained and the information | 77 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” of the n→K0 reaction are extracted. These results were compared with the theoretical calculations and the K reaction. In this presentation, we will talk the NKS experiment and its results. Po-35 Analysis of text structure by investigating how sentences line up Sho Furuhashi Department of Physics, Tohoku University Abstract: There are a lot of systems whose components have some interactions or relationships among them in many fields. Friendship, World Wide Web and food web are examples of such systems. To understand the systems, graph representations are quite useful in general. Studies on complex networks are aimed to investigate those graphs, which often exhibit common features such as small world and scale-free. Text consists of words, segments, phrases and sentences and these constituents have certain relationships. For example, grammatical relationship, semantic similarity and co-occurrence in a sentence can be considered as relations among words. Studies of these relations in the framework of complex networks have been done in the present study. In our study, we have analyzed sentence co-occurrence in terms of complex networks by use of the texts which are in the public domain. In this presentation, we will show the result of the statistical analysis for both in Japanese and English texts. Po-36 Itinerant-Localized Transition in Two-Channel Kondo Lattice Shintaro Hoshino, Junya Otsuki and Yoshio Kuramoto Department of Physics, Tohoku University The dichotomy between itinerant and localized characters of electrons is one of the most fundamental problems in condensed matter physics. In typical heavy electron systems, the f electrons are localized in the high temperature region, and acquire the itinerancy by the interaction between f and conduction electrons with decreasing temperature. This is known as itinerant-localized crossover of f-electron states. In the present work, however, we show that the localized character of f electrons changes into itinerant one at the transition point in two-channel Kondo lattice systems. We have analyzed the system using the dynamical mean-field theory combined with the continuous-time quantum Monte Carlo method. With one or two conduction electrons per site, the system undergoes the staggered ordered phase below the transition temperature. At the same time, the heavy electron bands are formed, which indicates the itinerant f-electron states. Since f electrons acquire the itinerancy only below the transition temperature, this 78 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium behavior can be regarded as itinerant-localized transition of electronic states. We will discuss these behaviors through temperature dependence of the single-particle spectrum. Po-37 Space group determination of charge- and orbital-ordered phases of SmBaMn2O6 using convergent-beam electron diffraction Daisuke Morikawa Department of Physics, Tohoku University Abstract: A-site ordered perovskite-type oxide SmBaMn2O6 shows two kinds of charge- and orbital-ordered (COO) phases. Those types of oxides are suitable for quantitative structure analysis of charge- and orbital-ordered states because they have higher crystallinity than A-site disordered ones. In this study, we aim to determine the space groups and the COO models of SmBaMn2O6. Convergent-beam electron diffraction (CBED) experiments were conducted using a JEM-2010FEF transmission electron microscope equipped with an in-column omega-type energy filter. Intensities of electron diffraction were recorded on imaging plate. The accelerating voltage of electron microscope was 100kV. The CBED patterns were obtained at specimen temperatures of 300K and 90K. From the symmetries of CBED patterns taken with different incidences and dynamical extinctions, the space groups of SmBaMn2O6 at 300K and 90K were determined to be Pnam (No. 62) and Pmam (No.51), respectively. Possible models of the COO phases at 300K and 90K were discussed from the determined space groups. Po-38 Dopant dependence on charge/orbital orderings in La0.5Sr1.5MnO4 observed by resonant x-ray scattering Yuki Yamaki Department of Physics, Tohoku University Manganites are intensively studied because of their unique features such as colossal magnetresistance and multiferroics. When impurity ions are substituted for the manganese ion in the compound, a new local electronic state often emerges. In this study we have investigated the impurity effect on a typical charge/orbital ordered system, a layered manganite, using resonant x-ray scattering (RXS) technique to reveal experimentally the new state emerged by substitution of impurity ions. A layered manganite La0.5Sr1.5MnO4 shows orbital ordering below 220 K. We have studied how the ordering state is changed by the substitution of Cr, Fe and Ga ions for Mn ions using a RXS technique at absorption edge energy of Mn K-edge. Figure 1 shows temperature dependences of RXS intensities of (3/2 3/2 0) reflection, which reflect charge order, in La0.5Sr1.5MnO4 and La0.5Sr1.5Mn0.97T0.03O4 (T=Cr, Fe, Ga) near Mn K-absorption edge | 79 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” energy. These intensities in the figure are normalized by the intensity of the fundamental Bragg reflection (110). The RXS intensities of all doped compounds are smaller than that of pure compound, but degrees of decrease are different according to the dopants. Additionally, RXS intensities of Cr and Fe doped compounds drastically decrease in lower temperature than 90K and 70K, respectively. Figure 2 shows temperature dependence of RXS intensities of (5/4 5/4 0) reflection, which reflect orbital order, in all compounds near Mn K-absorption edge energy. These intensities in the figure are normalized by the maximum intensity of (5/4 5/4 0) reflection in each compound. In all compounds, the RXS intensities of (5/4 5/4 0) reflection have the same temperature dependence as that of (3/2 3/2 0) reflection. These results indicate that the charge/orbital ordering states are suppressed by the substitution of impurity ions, but the degrees of suppression of the orderings vary with impurity ions. ×10-5 Q=(3/2 3/2 0) Q=(5/4 5/4 0) 15 1.2 ) ) Pure Pure Cr 3% 1 Ga 3% (11 0) Fe 3% OO(MAX) Fe 3% /I 10 Ga 3% /I 0.8 Cr 3% CO OO 0.6 5 0.4 0.2 RXSIntensity (I 0 RXSIntensity (I 0 0 50 100 150 200 250 300 0 50 100 150 200 250 300 Temperature (K) Temperature (K) Figure 1. Temperature dependence of RXS Figure 2. Temperature dependence of RXS intensities of (3/2 3/2 0) reflection in intensities of (5/4 5/4 0) reflection in La0.5Sr1.5MnO4 and La0.5Sr1.5Mn0.97T0.03O4 (T = La0.5Sr1.5MnO4 and La0.5Sr1.5Mn0.97T0.03O4 (T = Cr, Fe, Ga). Cr, Fe, Ga). Po-39 Semi-classical coupled-channels calculation for heavy-ion reactions Shusaku Yusa Department of Physics, Tohoku University In heavy-ion reactions near the Coulomb barrier, nuclear excitations during the collision play an important role. For example, sub-barrier fusion cross sections are strongly enhanced by orders of magnitude due to the excitation effect. The coupled-channels method has been employed as a standard approach to take into account such an excitation effect. It has successfully accounted for experimental data for heavy-ion reactions by taking into account, conventionally, a few low-lying collective excitations. Recently, however, a few experimental data that cannot be accounted for by the conventional coupled-channels method have been obtained. Some of these experiments suggest that the non-collective excitations, which are 80 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium usually not taken into account explicitly in the coupled-channels calculations, play an important role. In the previous work, we investigated the role of this kind of excitations using a schematic one-dimensional model and showed that these excitations explain a qualitative behavior of the experimental data. In order to extract quantitative conclusions, it is necessary to perform realistic three-dimensional calculations. This requires a solution of large dimensional coupled-channels equations. In order to resolve this problem, we use semi-classical method. We show our results for heavy-ion quasi-elastic scattering and discuss the validity of this approach. Po-40 Crystalline electric field study in pyrochlore-type iridate Nd2Ir2O7 with metal-insulator transition M. Watahiki, K. Tomiyasu, K. Iwasa, K. Matsuhira A, S. Takagi A, M. Wakeshima B and Y. Hinatsu B Department of Physics, Tohoku University, A Faculty of Engineering, Kyusyu Institute of Technology, B Division of chemistry, Graduate School of Science, Hokkaido University Materials with pyrochlore lattice attract much attention in a field of geometrical frustration. The pyrochlore-type 3+ 4+ iridate Nd2Ir2O7 with two magnetic Nd (J = 9/2) and Ir (S = Jeff = 1/2) ions exhibits metal-insulator (MI) transition at TMI = 36 K [1]. 3+ From specific heat measurement, magnetic entropy of Nd ion was estimated to reach R ln2 at TMI (R : gas constant), meaning that crystalline electric field (CEF) ground state of Nd3+ ion is doublet. In addition, Schottky anomaly was also observed at around 5 K in specific heat measurement, suggesting that the ground doublet is split below TMI [2]. In magnetic susceptibility measurement, temperature dependence of magnetic susceptibility shows a difference between Zero-field-cooling (ZFC) and field-cooling (FC) conditions below TMI [2]. Similar behaviors were also observed in other RE2Ir2O7 (RE = Y, Sm, Eu, Lu) series [1, 3]. Since RE = Y and Lu have no magnetic moments, the origin of the difference between ZFC and FC conditions is considered to be magnetic ordering or freezing of Ir4+ ions. It is predict that Nd3+ ions feel a static internal magnetic field from Ir4+ ions. 3+ In this presentation, we studied CEF excitations of Nd ion by powder neutron scattering on Nd2Ir2O7 as basic information. [1] K. Matsuhira et al., J. Phys. Soc. Jpn. 76 (2007) 043706. [2] K. Matsuhira et al., J. Phys. Soc. Jpn. (submitted). [3] N. Taira et al., J. Phys.:Condens. Matter 13 (2001) 5527. | 81 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” Po-41 Back action control of GaAs mechanical resonator by carrier excitation Takayuki Watanabe Department of Physics, Tohoku University We investigate back action control of micro-scale GaAs mechanical resonator with carrier excitation. There are several ways to control resonance vibration of mechanical resonators with back action force or feedback force. The laser is one of the most used instruments and several different properties are used (e.g. photothermal effect and radiation pressure). We use other unique property which is induced by carrier excitation [1]. However, we do not still clarify the mechanism completely. Main purposes of our research are making it more clearly. We report present progress condition which contains topics about launch the measurement systems, wafer structure, brief measurement result and so on. 1) H. Okamoto et al. Appl. Phys. Express 2 (2009) 035001 Po-42 Study of the charge dynamics in Sr14-xCaxCu24O41 by resonant inelastic x-ray scattering Masahiro Yoshida Department of Physics, Tohoku University Sr14-xCaxCu24O41 (SCCO), which is composed of two-leg ladders and edge-sharing chains, is the first superconducting cuprate without CuO2 planes. By substituting Ca for Sr, holes are transferred from the chains to the ladders[1]. It was recently shown that charge ordering along the leg direction in the ladder occurs at x = 0 and x ~ 11, and the periodicity is five and three times the unit length along the c axis, respectively [2]. In order to investigate the electronic excitations associated with the CO, we carried out resonant inelastic x-ray scattering (RIXS) experiments for SCCO(x = 0, 3, 6, 9, 11.5). Cu-K RIXS can directly probe the momentum-dependent electronic excitations related to the Cu site, which are resonantly enhanced by tuning the incident photon energy to the Cu K edge. We measured both momentum and temperature dependence of the intraband excitations, which is associated with the dynamics of doped holes in the Zhang-Rice singlet band. Accordingly, we observed two difference excitations with doping. We conclude that charge fluctuations associated to the charge order in the ladder exist in lower doping while dispersive mode reflecting metallic behavior appears in higher doping. These two electronic states gradually change upon doping without clear-cut boundary. [1] - M. Kato et al., Physica C 258, 284, (1996). 82 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium [2] - A. Rusydi et al., Phys. Rev. Lett. 97, 016403, (2006) Po-43 Terahertz beam control using femtosecond laser interference technique Koji Uematsu Department of Physics, Tohoku University Abstract: Terahertz(THz) waves, which lie in the frequency range from 100GHz to 10THz, exhibit properties of both radio waves and light waves. They penetrate various soft materials such as plastics, paper, cloth, and many others and show specific absorption spectra. These properties can be utilized for many applications such as non-destructive evaluation for hazardous materials, identification of medicines and inspection of agricultural products. Therefore, THz sensing and imaging technologies have been attracted a lot of interest. However, it is required long time to acquire THz images because the measuring speed is mainly limited by the speed of the mechanical devices to move the samples. It is one of the major technical obstacles blocking THz imaging in practical applications. In this poster presentation, I will propose a quicker steering method of THz beam that is based on array antenna theory and interference principle of light. I will demonstrate THz-wave propagation direction and THz frequency that are controllable by changing the interference pattern of two femtosecond laser pulses. Po-44 Metal-Contact Effect on Short Channel Graphene Field-Effect Transistors Nobuhiko Mitoma Department of Physics, Tohoku University Graphene is a rising star in recent condensed matter physics. It has been attracting much interests not only from the viewpoint of fundamental physics but also as an exciting potential candidate for future electronic devices. Here, we investigate carrier doping effect from metal contacts in short-channel graphene field-effect transistors (FETs). One mainstream of the future electronics is downsizing. Smaller devices can be integrated more densely. Short-channel FETs can show a ballistic transport, good heat dissipation properties, and so on; however, it is known that graphene can be doped from the contacted electrodes[1,2]. If a channel length of a device becomes shorter, the carrier doping effect becomes more dominant in the overall device resistance. For the future application, we cannot neglect such effect. Resistance of a graphene FET is given by a summation of the graphene channel resistance and contact resistance, and the channel resistance is proportional to the channel length. Therefore we can investigate such characteristics using the so-called transfer line method (TLM). The contact resistance should be positive; however, we often find negative contact resistances. This implies the limitation of TLM, and we propose a method to evaluate contact and channel resistances properly. | 83 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” Po-45 Triaxial Deformation of sd-shell Lambda Hypernuclei Myaing Thi Win, K. Hagino and T. Koike Department of Physics, Tohoku University One of the main interests in hypernuclear physics is to investigate how an addition of lambda hyperon influences the properties of the atomic nuclei. With the presence of lambda hyperon as impurity, some bulk properties of nuclei such as the shape, size and collective motion may be changed. The investigation of the change of nuclear shape due to the addition of lambda particle become of theoretically interest using the self-consistent mean-fields approaches such as the relativistic and non-relativistic mean field models. To this end, we extend the previous mean-field studies of axially symmetric hypernuclei by taking into account the triaxial degree of freedom. For this purpose, we use the constrained Skyrme Hartree-Fock + BCS approach on the three-dimensional Cartesian mesh. We discuss the potential energy surfaces of some sd-shell hypernuclei such as 28Si+, 26Si+ , 26Mg+ and 24Mg+, etc. We show that the lambda particle makes the energy surface slightly softer along the triaxial degree of freedom ―gamma‖, although the gross feature of the energy surface remains similar to that of the corresponding core nuclei. Po-46 Excitation energy dependence of coherent phonon amplitudes in single wall carbon nanotubes A. R. T. Nugraha and R. Saito Department of Physics, Tohoku University Abstract: Ultrashort laser pulse (~10 fs) pumped to a single wall carbon nanotube (SWNT) sample can induce photo-excited carriers called excitons (electron-hole pairs bound by the Coulomb interaction) which appear at the same time in the excited states of the SWNT. Before recombination of the electron-hole pairs, the lattice starts to vibrate coherently by electron-phonon interaction in the same phase. This process is known as coherent phonon (CP) spectroscopy. The CP vibration has been observed as an oscillation of transmittance in the probe pulse of the pump-probe spectroscopy. After making Fourier transform of the transmittance with respect to time we obtain the spectrum as a function of phonon frequencies, from which we can observe some important SWNT phonon modes, such as the radial breathing mode (RBM), G mode, and D mode. Here we calculate the dynamics of coherent phonons in SWNTs with different chiralities by solving a driven oscillator equation obtained from the Heisenberg equation of motion. We include geometry optimization and curvature effects in the calculation, which is necessary for considering small diameter nanotubes. In particular, we examine coherent RBM phonon amplitudes in semiconducting SWNTs by changing excitation energies within 84 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium 0.5-4.0 eV. We find that the CP amplitudes can even change the sign of amplitudes and that the phase of CP oscillations for each SWNT is strongly chirality dependent as well. From this simulation, we are able to predict how the SWNT diameter changes in response to femtosecond laser excitation, especially to understand whether the diameter of a given SWNT will initially increase or decrease. Po-47 Calculation for Vibrational and NMR properties of Polyynes And Microscopic studies of Polyynes@SWNT ○ Md. Mahbubul Haque1, Lichang Yin2, Ahmad R. T. Nugraha3, Riichiro Saito3, Tomonari Wakabayashi4, Yohei Sato1, Masami Terauchi1 1Institute of Multidisciplinary Research for Advanced Materials Tohoku University, Sendai, 980-8577, Japan 2Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, 72 Wenhua Road, Shenyang, 110016, China 3Department of Physics, Tohoku University, Sendai, 980-8578, Japan 4Department of Chemistry, School of Science and Engineering, Kinki University Kowakae 3-4-1, Higashi Osaka 577-8502, Japan Polyynes are finite-sized, one-dimensional linear molecules of carbon atoms with alternate single and triple bonds and hydrogen termination at the both ends. They are commonly expressed by C2nH2, where n is an integer. We have reported our calculations for the bond-stretching phonon modes of such linear polyynes by adopting density functional theory. It is found that there are two intense Raman bands so called α and β bands in the higher frequency region around 2000 - 2200 cm−1. The frequency of α mode monotonically decreases with the increase of polyyne chain length while that of the β mode shows oscillating behavior, which are consistent with previous Raman measurements [1]. The nature of α phonon mode is such that it is the bond-stretching mode with fixed hydrogen atoms while the β mode is the bond-stretching mode with changing the length of the molecule. The relative Raman intensities of the two phonon modes are evaluated by optimized geometries for ground states and excited states. The vibration induced by the photo-excited carriers mainly consists of α mode, which explains the stronger relative Raman intensity for α mode than that for the β mode for all C2nH2 molecules. We also present a nuclear magnetic resonance (NMR) calculation for spin-spin coupling constants as a function of distance between 1H and 13C nuclei and, within 13C nuclei, up to the polyyne center of symmetry. We compare the calculated results with recent NMR experiments [2]. Such linear chains are usually unstable in the air but very stable inside single wall carbon nanotube (polyyne@SWNT) [3]. The Fig. 1 shows the HRTEM (High Resolution Transmission Electron Microscope) image of isolated SWNT and bundle of SWNTs in which we are expecting the | 85 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” encapsulation of polyynes inside SWNTs. Although it is very difficult to observe the direct image of polyynes, we will report the analysis of electron diffraction pattern for such a system which would be useful to confirm the encapsulation. We will also report our microscopic study e.g. electron energy loss spectroscopy (EELS) for polyynes in the near future. Figure 1. HRTEM image of isolated SWNT and bundle of SWNTs possibly encapsulating polyyne molecules. The image obtained by TEM, JEOL 2010. [1] Tabata H, Fujii M, Hayashi S, Doi T, Wakabayashi T, Carbon, 44, 3168 (2006) [2] Wakabayashi T, Tabata H, Doi T, Nagayama H, Okuda K, Umeda R, Chem Phys Lett, 433, 296 (2007) [3] Nishide D, Dohi H, Wakabayashi T, Nishibori E, Aoyagi S, Ishida M, Chem Phys Lett, 428, 356 (2006). Corresponding Author: Md. Mahbubul Haque TEL: + 81-(0)22-217-5374, FAX: +81-(0)22-217-5373, E-mail: [email protected] 86 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium Po-48 The new generation experiment of hypernuclear γ-ray spectroscopy at J-PARC Taofeng Wang Department of Physics, Tohoku University Abstract: Understanding baryon-baryon interactions is one of the main topics in nuclear physics and astrophysics, since hyperon-nucleon (YN) or hyperon-hyperon (YY) interactions serve as a key role not only in the investigation for the structure and properties of building blocks of matter, but also in the exploration and comprehension of neutron stars. The experimental data of hypernuclear γ-ray spectroscopy are believed to provide invaluable information for exact modeling YN interactions. In addition, the magnetic moment of a Λ in nucleus is expected to be derived from the lifetime of the γ-emitting excited state of hypernucleus. The new experiments of hypernuclear γ-ray spectroscopy will be performed soon at K1.8 beam line in J-PARC by means of the SKS spectrometer system and a compact germanium detector array, 4 19 namely, Hyperball-J. Two light hypernuclei Λ He and Λ F are chose to be investigated in the first stage. We will measure the ground state doublet spacing (1+, 0+) of to clarify the ΛN-ΣN coupling and charge symmetry breaking (CSB) effects, which is a long-standing puzzle in the ΛN interaction. The cross sections of Λ hypernuclear production by (K-, π-) reaction for the spin-flip and non-spin-flip will be obtained from the γ-ray yield of M1 transition (1+→0+) of . In the case of the study for , the doublet spacing (3/2+, 1/2+) will be measured in order to give the first evidence of the radial dependence of the ΛN spin-spin interaction for sd-shell hypernuclei. Additionally, the effective g-factor of the Λ hyperon in will be obtained from the reduced transition probability B(M1) by analyzing the partly-Doppler-broadened γ-ray peak shape with the DSAM method. The physics idea, experimental method and apparatus are mainly described in this presentation. Po-49 Towards a double beta decay experiment with KamLAND Azusa Gando Department of Physics, Tohoku University Abstract: The Kamioka Liquid scintillator Anti-Neutrino Detector (KamLAND) is a low energy neutrino detector with 1 k-ton highly purified liquid scintillator(LS). Superiority of this detector in its size and ultra low background will be appropriate for rare event search; the next goal of KamLAND is to search a neutrino-less double beta decay to understand the nature of neutrinos. | 87 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” Neutrino-less double beta decay described by the process A(Z) -> A(Z+2) + 2e- is extremely rare process not yet observed. This remarkable decay that violates the lepton number conservation requires two characteristic neutrino properties: non-zero mass and Majorana particle. If we observe the decay, we learn the neutrino property (Dirac/Majorana), mass hierarchy, and its effective mass via its half-life. With a little improvement of the detector, KamLAND will search this rare decay with 400 kg of 90% enriched 136Xe nuclei loaded into LS at the 1st phase from 2011. Current and developing statuses of experiment will be reported. Po-50 Dead-time free DAQ with MoGURA and its contribution to KamLAND experiment Takemoto Yasuhiro Department of Physics, Tohoku University Abstract: MoGURA is designed to eliminate dead-time existing in the current KamLAND DAQ so as to tag neutrons induced with radioactive nuclides by a residual muon flux. The long life ones of those nuclides are one of the main background sources for KamLAND, but it is simulated that those nuclides can be rejected analytically by tagging them with the neutrons. MoGURA consists many electronics: eighty nine baseline restorers called BLRs, one hundred and three MoGURA FADC boards, one MoGURA Trigger board, six trigger command distributors called piggy-back, and one Rubidium frequency standard unit. All most all of them are already installed in the KamLAND electronics hut. The DAQ software written with KiNOKO for MoGURA had taken KamLAND data for about one month with the similar DAQ setting with the current KamLAND DAQ setting and has taken KamLAND data for about another one month with a new DAQ setting running freely from dead-time. KamLAND experiment is going to focus on double beta decay experiment to explorer the nature of neutrinos. The dead-time free capability and some of other properties of MoGURA are required for the experiment. In this symposium, the status and the contribution of the MoGURA DAQ will be reported. Po-51 Orbital Degenerate System in Frustrated Checkerboard Lattice Joji Nasu and Sumio Ishihara Department of Physics, Tohoku University Abstract: Orbital degree of freedom is one of the recent attractive themes in transition-metal oxides. In contrast to the spin degree of freedom, the orbital interaction explicitly depends on the bond direction, and a certain kind of frustration 88 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium exists. In the geometrical frustrated lattice, cooperating and competing effects between the orbital frustration and the geometrical frustration provide new features in the static and dynamical properties of orbital. The present purpose is to study the intrinsic orbital frustration effect in a geometrical frustrated lattice. We introduce the spin-less Hubbard-type model with the doubly degenerate dyz and dzx orbitals in the checkerboard lattice. The z z effective Hamiltonian for the strong correlation limit is derived. We have the JzSi Sj type Ising interaction for the x x nearest-neighbor bonds and the JxSi Sj type Ising one for the next nearest-neighbor bonds. Here S is the orbital pseudo-spin operator. In the mean-field approximation, there is a macroscopic number of degeneracy at the frustration point Jx/Jz =2. In the classical Monte-Carlo simulation, we have a staggered orbital order and the reentrant phase-boundary. This feature is owing to the ―order by fluctuation‖ mechanism. In the analyses by the spin-wave approximation and the exact diagonalization method, a large damping of the high-energy orbital dynamics due to the frustration is observed. Po-52 Gamma-ray spectroscopy of 19F-lambda Kenji Hosomi Department of Physics, Tohoku University Abstract: We are planning to study structure of 19F-lambda hypernucleus by high-resolution gamma-ray spectroscopy technique. Employing the K1.8 beam line at J-PARC and the SksMinus spectrometer system, we produce excited states of 19F-lambda using 1.8 GeV/c (K-,π-) reaction. We detect gamma rays from exited 19F-lambda using Hyperball-J, newly-constructed large germanium detector array dedicated to hypernuclear gamma-ray spectroscopy in the high intensity beam condition at J-PARC. One of the purposes of this experiment is to measure the reduced transition probability (B(M1)) of the Λ spin-flip M1 transition and extract g-factor of a Λ in nuclear medium for the first time. Another purpose is to investigate the ΛN interaction further than our previous studies. In this presentation, experimental technique how we measure the (B(M1)) will be explained as well as physics motivation. Po-53 First Evidence of the Suppressed B Meson Decay B-DK-, DK+- Yasuyuki Horii Department of Physics, Tohoku University Abstract: We report the first evidence of the suppressed decay chain B-DK- followed by DK+-, where D indicates a D0 meson or its antimeson. An interference of the two decay paths, corresponding to the two intermediate D states, | 89 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” provides an important information on the CP-violating angle 3. We measure the ratio RDK of the suppressed decay - - - + rate to the favored decay rate, obtained in the chain B DK , DK , and the asymmetry ADK between the charge +0.44 +0.07 -2 conjugate decays of the suppressed mode as RDK = [1.63 -0.41(stat) -0.13(syst)] x 10 and ADK = +0.26 +0.04 + - -0.39 -0.28(stat) -0.03(syst). The results are based on the final data sample recorded at the KEKB e e storage ring with the Belle detector corresponding to 772 x 106 B meson pairs produced at the (4S) resonance. Po-54 Transition of the Fermi surface topology in highly-doped NaxCoO2 Toshiyuki Arakane Department of Physics, Tohoku University Abstract: The discovery of the superconductivity in hydrated NaxCoO2 [1] has attracted much attention, because of the various similarities to other layered oxide superconductors such as cuprates. It is known that non-hydrated NaxCoO2 shows a variety of physical properties as a function of Na doping. At highly-doped region (x > 0.75), this system shows three-dimensional (3D) spin density wave (SDW) transition below TN ~ 22 K with the strong inter-layer magnetic interaction [2]. To investigate the electronic structure relevant to the SDW transition, we have performed high-resolution angle-resolved photoemission-spectroscopy (ARPES) on NaxCoO2 by systematically varying the Na doping content x. In highly-doped region of x > 0.75, we found an a1g large Fermi surface (FS) around Γ(A) point, while the eg‘(FS near K(H) point is absent, like in lower-doping samples of x < 0.75 [3]. In addition, we clearly found that a1g FS shape shows a strong wiggling behavior along the kz direction and new 3D electron-like FS appears around the Γ point. These experimental facts well explain the 3D nature of magnetic properties [2] as well as the enhanced thermo-electronic power [4] in highly-doped region. [1] K. Takada et al, Nature (London) 422, 53 (2003). [2] S. P. Bayrakci et al, Phys. Rev. Lett. 94, 157205 (2005). [3] H.-B. Yang et al, Phys. Rev. Lett. 92, 246403 (2004). [4] K. Kuroki, and R. Arita, J. Phys. Soc. Jpn. 76, 083707 (2007). Po-55 Study of B-pi tagging method at the Y(5S) resonance for the measurement of CP-violation parameter sin2phi1 Yutaro Sato Department of Physics, Tohoku University Abstract: To know initial state of neutral B meson is essential for the measurement of CP-violation in the B meson. We present a method of tagging the flavor of neutral B meson produced at the Y(5S) resonance. At the Y(5S) resonance, 90 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium the initial flavor of the neutral B meson is determined by the charge of the pion in decay modes like Y(5S) B0 B- pi+ and anti-B0 B+ pi-. The CP-violation in the B meson could be measured using the flavor tagging. The results are based on a large data sample collected at the Y(5S) resonance with the Belle detector operating at the KEKB asymmetric-energy e+ e- collider. Po-56 Anomalous Rashba effect of Bi(111) surface studied by high-resolution spin-resolved ARPES Akari Takayama Department of Physics, Tohoku University Abstract: Spin-resolved angle-resolved photoemission spectroscopy (ARPES) is a powerful experimental technique which can simultaneously determine all three quantum parameters of electron in solids, namely energy (E), momentum (k), and spin. Although ordinal (spin-integrate type) ARPES has been known as useful method for measuring of the electronic states in solids, spin-resolved ARPES is not so popular as ordinal one due to its low efficiency of the electron spin detector. Indeed, energy resolution of spin-resolved ARPES is typically 100 meV, two-order-magnitude lower than that of ordinal ARPES. To overcome such a difficulty, we have developed a new spin-resolved ARPES spectrometer equipped with a highly efficient mini Mott detector. The spectrometer achieves the energy resolutions of 8 meV for spin-resolved mode. Furthermore, the spectrometer can determine three-dimensional spin-polarization by using a 90° electron deflector situated before the Mott detector. By using the newly developed spectrometer, we have performed spin-resolved ARPES of bismuth (Bi) thin film on Si(111) to investigate the spin structure of surface state. While it is well known that the strong Rashba-type spin-obit interaction in the Shockley surface state of Bi lifts the spin-degeneracy of the band, we have uncovered some anomalous behavior which cannot be explained by simple Rashba effect as seen in Au(111) surface. In this presentation, we show a detail of spin-resolved ARPES spectrometer as well as anomalous spin texture of Bi(111) surface state. Po-57 Hypernuclear -ray spectroscopy system: Hyperball-J Takeshi Yamamoto Department of Physics, Tohoku University Abstract: At the J-PARC facility, several light hypernuclei will be studied via -ray spectroscopy at the K1.8 beam line as a Day-1 experiment (E13). Gamma rays from the hypernuclei are detected by a new germanium(Ge) detector array, Hyperball-J, for ultra high energy deposit and high count rate. The array consists of 32 coaxial Ge detectors surrounded by PWO counters for background suppression. One of the array‘s features is mechanical cooling of Ge crystal for radiation-hardness. We have developed Ge detector-cooler unit which achieved comparable energy | 91 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” resolution with that of the LN2 cooling. PWO counters ware introduced for fast background suppression instead of BGO counters used at the past experiments. The dead time due to decay time of light production is shorter. To increase light yield, PWO crystals are cooled down to about -20 C. This is first challenge to use PWO for low energy gamma ray. Now, we are mounting detector to Hyperball-J frame and checking performance of them. Current status of the array will be presented. Po-58 Phase diagram and critical exponent of metal-insulator transition in disordered topological insulator Ai Yamakage Department of Physics, Tohoku University Effects of disorder on two-dimensional Z2 topological insulator are studied. The phase diagram is derived for a model of HgTe quantum well. In the presence of spin-orbit coupling which breaks conservation of z-component of spin, a finite metallic region is found that partitions the two topologically distinct insulating phases. As disorder increases, a narrow-gap topologically trivial insulator undergoes a series of transitions; first to metal, second to topological insulator, third to metal, and finally back to trivial insulator. We show that this multiple transition is a consequence of two disorder effects; renormalization of the band gap, and Anderson localization. Critical exponent of the metal-insulator transition in the present model is 2.7 which is consistent with the value predicted by the conventional theory. Po-59 Quasinormal modes of small Kerr-AdS black holes Nami Uchikata Astronomical Institute, Tohoku University Abstract: Superradiance is a phenomenon in which impinging waves are amplified as they scatter off an absorbing rotating object, such as a Kerr black hole, by extracting its rotational energy under certain condition. Unlike in asymptotically flat spacetime, the quasinormal modes (QNM) of the rotating (Kerr) black holes in asymptotically anti de Sitter (AdS) spacetime satisfy the superradiance condition. Then it is expected that Kerr-AdS black holes are unstable if their QNM satisfy the superradiance condition. The AdS boundary behaves as an effective wall that encloses the black hole, then the impinging waves will be reflected at the AdS boundary and reamplified each time they scatter off the holes. We have investigated the quasinormal modes of small Kerr-AdS black holes analytically and numerically for scalar perturbations. It is found that small Ker-AdS black holes become unstable via superradiant amplification 92 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium mechanism for some rotation rates. Po-60 Test of inflation Naonori Sugiyama Astronomical Institute, Tohoku University Abstract: While it is well-known that the universe began from a very hot and dense state called ―Big Bang‖, many cosmologists now think that there was a period even before the ―Big Bang‖. It is called ―inflation‖. In this ―inflation period‖, the universe has expanded more rapidly than it does today, and this is the reason for its name ―inflation‖. Unfortunately, we have not yet obtained a satisfactory physical description of inflation because we do not have cosmological observation accurate enough to reach it. Indeed, lack of such observations allows theorists invent many inflation models different from each other when comparing those in various aspects. In short, ―The number of inflation models is being inflated‖. In this work, we derived a quite general inequality among observable quantities by considering a concept called ―Non-Gaussianity‖. This inequality should be satisfied by almost all inflation models considered today. If future observation suggests that our inequality does not hold in our universe, our inequality can rule out almost all models subject to it. Po-61 Loop Quantum Cosmology –path integral analaysis- Kazuya Fujio Astronomical Institute, Tohoku University Abstract: Quantum cosmology is one of the most ambitious subject in physics. Its aim is to treat the Universe itself by quantizing spacetime and to explain the creation of Universe. We do not have a complete theory of quantum gravity yet, but some candidates are exist. Particularly loop quantum gravity has good natures e.g. non-perturbative, background independent. Quantum cosmology basing on loop quantum gravity, called Loop Quantum Cosmology, have progressed in last decade. For example, in symmetry reduction model, it has been shown that big bang singularities are replaced with big bounce by quantum effect. However, even if in toy model, the full analysis is very complex. So the path integral formulation and using first order analysis will be convenient tools. In this presentation, path integral analysis of closed FRW universe with massive scalar field will be reported. | 93 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” Po-62 Development of refractive Fourier Transform Spectrometer to realize multiband modulator for polarizing signal in millimeter and THz wave bands Luo Yuan Department of Astronomy, Tohoku University Abstract: Polarization of the cosmic microwave background radiation (CMB) is known to tell us physics of genesis of the universe. Since the expected intensity of the polarization signal is embedded in the polarization signals come from astronomical objects, improvement of accuracy of components separation into CMB component and astronomical components is one of the crucial issues for the success of CMB polarization observation. To achieve this, multiband polarization observation is mandatory. We developed the refractive polarizing Fourier Transform Spectrometer (abbreviated as r-FTS) by using the birefringence material Sapphire, to realize multiband modulator for polarizing signal in millimeter and THz wave bands. In this poster, the basis of r-FTS and the results of optical experiments in millimeter wavebands will be reported. Po-63 Planetary Spectra Libraries Ramsey Guy Lundock Astronomical Institute, Tohoku University Abstract: We compiled and published the Tohoku-Hiroshima-Nagoya Planetary Spectra Library (THN-PSL). This is the first library to include spectra for all of the solar system planets. The dwarf planets Ceres and Pluto are also included, as well as data for several moons. By compiling planetary spectra in an easy to compare format, we discovered a simple method to classify planets based on their astronomical color data. It is possible to distinguish three groups of planets: gas, soil, and ice. The THN-PSL will be a useful comparison when reflection spectra for extrasolar planets become available in the near future. However, there were some outstanding questions. First, Venus‘s spectrum is difficult to distinguish from ice planets in the near infrared. Second, Jupiter and Saturn have distinct cloud decks as opposed to the haze of Uranus and Neptune, but the infrared spectra for all four planets are difficult to distinguish. To answer these questions we composed the Tohoku-Gunma Planet Spectra Library (TG-PSL). The THN-PSL covers a range of 0.45 to 2.5 microns. The new TG-PSL covers a range of 0.4 to 0.8 microns, and provides new information which breaks the Venus/ice and cloud/haze degeneracies. In this presentation, we report our findings. 94 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium Po-64 Resuming cosmological perturbations via the Lagrangian picture: Two-loop result in real space Tomohiro Okamura Astronomical Institute, Tohoku University Abstract: The cosmological large-scale structure (LSS) is the largest structure in the universe and dominated by the dark matter (~80%). The growth of LSS is determined by the expansion history of universe and the theory of gravity. From the observation for the statistical properties of the LSS, especially the power spectrum, we can know the ingredient of the universe and test the General Relativity. Theoretically, the LSS is expressed as perturbation of cosmic matter density field and well modeled not only analytically but also numerically. In the Lagrangian perturbation theory (LPT), one of the approaches to study the LSS analytically, the cosmological perturbed field is represented as the displacement field via the Lagrangian picture. The earlier work which calculates the power spectrum up to one-loop correction showed that the infinite series of terms in standard Eulerian perturbation theory are resumed as a result of starting from a Lagrangian description of perturbations and the nonlinear effect are more accurately described by the LPT. This approach also enables us to calculate the cosmological perturbations in observable redshift space without another approximation. In this presentation, we report the current status of our analytical calculation, two-loop result in real space, and also discuss the future prospects. | 95 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” Po-65 Po-66 On the topology of singularities of polynomial maps Kazumasa Inaba Department of Mathematics, Tohoku University Abstract: The study of topology of singularities starts from the books of John Willard Milnor ―Singular Points of Complex Hypersurfaces‖. He introduces so-called the Milnor fibration and studied the singularities using this fibration. The topology is well-studied for isolated singularities of compiex polynomial maps. On the other hand, the study of real polynomial maps is still difficult. In this presentation, we observe the vector field canonically produced from Milnor‘s fibration of real polynomial maps. In particular, we determine Hopf invariant of certain examples. 96 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium Po-67 Well-posedness and ill-posedness for some nonlinear parabolic equations Tsukasa Iwabuchi Mathematical Institute, Tohoku University Abstract: We consider the Cauchy problems for the Navier-Stokes equations, the Keller-Segel system and nonlinear heat equations, and local and global solutions are obtained in some function spaces, which are characterized by the generalization of Sobolev spaces. We say the Cauchy problem is well-posed if the solution exists uniquely and depends on initial data continuously, and otherwise, the Cauchy problem is ill-posed. The condition for the well-posedness depends on the regularity of initial data. One of the purposes is to obtain solutions in large function spaces. Another purpose is to show the ill-posedness and reveal the largest function spaces for the well-posedness. Po-68 Imperfect bifurcation for the Liouville-Gel'fand equation on a perturbed annulus Toru Kan Mathematical Institute, Tohoku University Abstract: We consider a bifurcation problem of the Liouville-Gel'fand equation under the Dirichlet boundary condition. In the case where a domain is an annulus, this problem has an unbounded branch which consists of radially symmetric solutions, and moreover, there are infinitely many symmetry-breaking bifurcation points on the branch. Since such bifurcation points are weak for a perturbation, there is a strong possibility that solution branches near the bifurcation points break (namely, the bifurcations become imperfect) when an annulus is perturbed. Whether or not such a phenomenon actually occurs is studied, and a sufficient condition for the phenomenon is obtained. Po-69 Rigid Analytic Continuation of a Hypergeometric series and arithmetic-geometric mean over 2-adic fields Kensaku Kinjo Mathematical Institute, Tohoku University Abstract: Let p be an odd prime. The hypergeometric series with the parameters ½, ½, 1 can be regarded as the power series over the p-adic field. The hypergeometric series is convergent only on the open ball with center 0 and radius 1. B. Dwork discovered that the ratio of hypergeometric series had an analytic continuation to the boundary and the | 97 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” function valued the unit root of affine ordinary elliptic curves as the special values. Dwork's theorem is proven by using the Gauss-Manin connection on the cohomology of a family of ordinary elliptic curves defined by the Legendre forms. To consider the case p=2 of Dwork's theorem, its proof does not work because the curve defined by Legendre form has a singular point if it is defined over a field with characteristic 2. In this presentation, we will introduce the case p=2 of Dwork's theorem by changing the equation which defines the affine ordinary elliptic curves. Moreover, we will talk the relation between the unit root of an ordinary elliptic curve and its canonical lift. Po-70 On the Hasse principle on several fields Makoto Sakagaito Mathematical Institute, Tohoku University Abstract: The map from the Brauer group of a global field to the product of the Brauer groups of the completions (the local-global map) is known to be injective. This classical result is called the Hasse principle. In the case of positive characteristic, global fields are algebraic function fields in one variable over finite fields. I proved that the Hasse principle of the Brauer group holds in the case where the ground field is PAC field. Examples of PAC field are separably closed fields and infinite extensions of finite fields. This result is the Hasse principle of 2 dimensional cohomology. Moreover, I ascertained that the Hasse principle of 3 dimensional cohomology on an algebraic function field in one variable over p-adic field. Po-71 98 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium Po-72 Po-73 On the Mordell-Weil groups of Mordell curves Tadahisa Nara Department of Mathematics, Tohoku University Abstract: We study an infinite family of Mordell curves with three explicit integral points. The points are independent in certain cases. In this poster we describe how to compute bounds of the canonical heights of the points. Using the result we can show that any pair in the three points can always be a part of a basis of the free part of the Mordell-Weil group. This is joint work with Yasutsugu Fujita. | 99 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” Po-74 100 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium Po-75 Po-76 How difficult to solve an unsolvable problem? Kojiro Higuchi Mathematical Institute, Tohoku University Abstract: The best known theorem on logic, which is the subject of the author, is the (first) incompleteness theorem achieved by Kurt Gödel in 1930‘s. The theorem says that for all strong computably axiomatizable consistent theories, e.g., ZFC which is an axiom system of first-order logic strong enough to cover almost all of theories of modern mathematics, there is a statement which is true and is not provable from the system. Furthermore, using the incompleteness theorem, we know that there is no computable completion of ZFC. In other words, there is no computably axiomatizable consistent theory which extends ZFC and is complete, i.e., any statement is provable or disprovable in the theory. Consider the following problem: to construct a completion of ZFC. This problem is an example of unsolvable problems as we have seen in the above. In fact, there are a lot of unsolvable problems. But, then, how far are those problems from solvable problems? Can we say that those problems have the same difficulty to be solved or not? In | 101 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” terms of computability theory, we can introduce orders among difficulties of those problems. The study of the author is to analyze those order structures. In the presentation, classical results on this study and a few of results of the author, including on the relations between those order structures and intuitionism, will be reported. Po-77 102 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium Po-78 Po-79 Global behavior of solutions for a mathematical model describing amoeba motion Harunori Monobe Department of Mathematics, Tohoku University Abstract: Amoeba motion is one of cell motions, and is caused by F-actin and G-actin. T. Umeda proposed a mathematical model composed of a free boundary problem with integral terms. This model is similar to the Stefan problem with surface tension and kinetic undercooling, so this problem is also interesting in the mathematical viewpoint. In this poster, we show the existence of the time global classical solutions under spherical symmetric conditions. From this result, we expect that there exists spherical stationary solutions. Po-80 Hadamardvariational formula for the Green matrix of the Stokes equation Erika Ushikoshi Mathematical Institute, Tohoku University, D1 We consider the Hadamardvariational formula, which represents the varitation of the Green function under a | 103 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” certain perturbation of its domain. In 1952, the Hadamardvariational formula was proved for Laplace equation by Garabedian-Schiffer and later on, it was proved for the general elliptic equation by Fujiwara-Ozawa in 1978. In this poster session, we prove the Hadamardvariational formula for the Green matrix of the Stokes equation as an example of an elliptic system of equations. Po-81 An approach to the existence for harmonic maps and Yang-Mills connections Toshiaki Omori Mathematical Institute, Tohoku University Abstract: In this talk, I would like to introduce several existence theorems for harmonic maps between Riemannian manifolds via exponentially harmonic maps. What I would like to discuss is the problem to find a harmonic map which represents a given homotopy class of continuous maps between given compact Riemannian manifolds. By means of an approximation via exponentially harmonic maps, we can reestablish the following classical existence theorems: (1) If the target manifold has non-positive sectional curvature, then a given homotopy class admits a harmonic map (due to J. Eells and J. H. Sampson). (2) If the domain is 2-dimensional and the 2-dimensional homotopy class of the target manifold vanishes, then a given homotopy class admits an energy minimizing harmonic map (due to J. Sacks and K. Uhlenbeck). Also, I would like to introduce an approximation of Yang-Mills connections via exponentially Yang-Mills connections. Especially, an existence result for exponentially Yang-Mills connections is discussed. Po-82 Restricted Caratheodory measure and restricted volume of canonical bundle Shin Kikuta Mathematical Institute, Tohoku University Abstract: In this talk, we report our trial up to now clarifying explicit relations between the measure hyperbolicities and the positivities of the canonical bundle. For this purpose, our method is to investigate the curvatures of the pseudo-volume forms defining the measure hyperbolicities. We particularly consider the Caratheodory measure hyperbolic case at this time. The concept of the Caratheodory measure hyperbolicity appears naturally when the Schwarz lemma is generalized to a higher dimensional case if it is regarded as the volume decreasing property. And it is defined by certain positivity condition of some intrinsic measure called Caratheodory measure. By its definition, it seems very likely that the measure hyperbolicity leads to the positivity of the canonical bundle. In fact, we obtained an explicit inequality between the volume with respect to the 104 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium Caratheodory measure and the volume of the canonical bundle until the last year. It is proved by investigating the curvature of the Caratheodory measure. In this year, we consider a restricted version of the inequality to subvarieties and have that a similar inequality holds by the same way as above. Namely we obtained a specific inequality between the volume with respect to the restricted Caratheodory measure and the restricted volume of the canonical bundle. Po-83 | 105 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” Po-84 Po-85 Propagation of real analyticity for the Euler equations Ryo Takada Mathematical Institute, Tohoku University Abstract: The Cauchy problem of the Euler equations describing the motion of perfect incompressible fluids in the whole spaces is considered with spatially non-decaying initial velocity in the framework of some Besov space. It is proved that if the initial velocity is real analytic then the solution is also real analytic in spatial variables. Furthermore, a new estimate for the size of the radius of convergence of Taylor‘s expansion is established. The keys of the proof are to introduce a proper weighted norm for the analyticity, and to derive the suitable estimates for the higher order derivatives of the nonlinear terms of the Euler equations. Po-86 Blow-up set for a semilinear heat equation and pointedness of the initial data Yohei Fujishima Department of Mathematics, Tohoku University Abstract: We study the location of the blow-up set for a semilinear heat equation with small diffusion. It is known that, under suitable assumptions, the solution blows up near the maximum points of the initial function if the diffusive constant is sufficiently small. We study the relationship between the location of the blow-up set and the level sets of the initial function. We also prove that the location of the blow-up set depends on the mean curvature of the graph of the initial function on its maximum points. 106 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium Po-87 The Cauchy problem for heat equations with exponential nonlinearity Norisuke Ioku Mathematical Institute, Tohoku University Abstract: We consider the Cauchy problem for semilinear heat equations in some Orlicz space which is a generalization of the Lebesgue spaces. In the Orlicz space, any power behavior of interaction works as a subcritical nonlinearity. We prove the existence of global solutions for the semilinear heat equation with the exponential nonlinearity under the smallness condition of the initial data in the Orlicz space. Po-88 An inquiry into the ethical significance of the precautionary principle: How to make decisions under uncertainty Yasuhiko Fujio Philosophy, D3, Tohoku University We must base our risk analysis and management on probabilistic or statistical approaches and assess the occurrence of events probabilistically or statistically. However, there are some realms of science in which we cannot use such approaches given the lack of sufficient scientific knowledge. Notwithstanding, we must make decisions despite such scientific uncertainty caused by insufficient knowledge of events which might bring about crucial risks. In order to deal with such uncertainty and evade serious and irreversible harms, we might have to introduce the ―precautionary principle‖. This principle requires the adoption of approaches, such as regulating or banning the use of chemical substances or technologies to protect the human health and the environment despite the lack of sufficient scientific certainty. Yet, while the economical and jurisprudential implications of the precautionary principle examined actively these days, the philosophical or ethical implications are not object of such scrutiny. Accordingly, we must consider the implications of the precautionary principle from the viewpoint of philosophy or ethics in order to make it useful as the principle of decision-making under uncertainty. It is therefore that in this presentation I will examine the conception of the ―hypothetical retrospection‖, i.e. the method of making morally acceptable decisions from a perspective situated at a given point in the future, and confirm the applicability of the precautionary principle as a principle of decision-making under circumstances of uncertainty. | 107 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” Po-89 The ontological genesis and structure of the theoretical attitude Tetsurou Yamashita Department of Philosophy, Tohoku University Abstract We human beings are involved in various things in various ways. This involvement in entity is always based on the preceding understanding about being of the entity concerned. The understanding of being and the involvement in entity, as one body, is performed in everydayness, that is, primarily in the practical form of the action in an environmental world. Theoretical, scientific attitude is the secondary form that is derived from the practical attitude. Based on this thought of Martin Heidegger, a German philosopher, I will provide in this presentation a sketch of the ontological genesis of the theoretical attitude, and clarify some features of the structure of this attitude by contrasting it with the practical one. The main features taken up here are as follows: freeness of viewpoint, simpleness of viewpoint, and objectification of entity. These features are united in the basic tendency (purpose) of the theoretical attitude toward seeing solely, which originally contributes to the practical attitude. Po-90 The Distinction between Social and Epistemic Values in Scientific Inquiry Mariko Nihei Department of Philosophy, Tohoku University Abstract: Recently, consensus has emerged on the point that science expresses a social activity or some form of social enterprise. Indeed, historians as well as sociologists of science provide numerous examples on how scientific activity is influenced by social factors of economic, political, gender or cultural nature. It is here that some philosophers of science assert that not only are the activities of scientists influenced by the scientist‘s social context but also that the justification of scientific knowledge is affected by these social factors at any point in time. Longino [1990/2002], one of the leading proponents of this view, states that social or non-epistemic factors penetrate into the whole process of science and denies the distinction between epistemic and social values in scientific inquiry. Indeed, I agree that social values do obtain a role as do epistemic values even in the justification of theories; yet I do not agree that this will result in the denial of a distinction between these two forms of value. In this presentation, I attempt to examine the plausibility and defectiveness of Longino‘s position by pointing out and complementing what appears to be lacking in her analysis - that is a framework which includes distinctions of moments which could be discriminated within the process of scientific inquiry. Building on the work of Lacey [1999/2005] and Matsumoto [2010], I attempt to provide a new conceptual model for scientific inquiry which accounts for the questions of when or how social and epistemic values act on the process of science. This model will provide a distinctive perspective on the relation between science and society, and the significance of science in 108 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium society. Po-91 The Faces of Perceptual Object Shun Sato Department of Philosophy, Tohoku University Abstract: Perception is, at least according to what is referred to as "direct realism", a kind of relation between mind and world. Yet it embodies also, unlike other kinds of relation, some peculiar dimension which may be called "phenomenological", and in virtue of which perception is not only an instantiation of a relation, but also one of "experience" in some pregnant sense. Such peculiarity will be shown most clearly when the one and the same object appears in various ways: the object of perception has different faces. Here, I suggest that these faces of the perceptual object can be approached in at least four different ways: the difference of faces in respect to (1) conception of the object, (2) familiarity with it, (3) the changing aspect of the object, and (4) the perspective according to which an object appears in relation to the subject. In this presentation, I investigate how these phenomena are related to each other, and what problems are presented by such a phenomenological consideration with regard to the philosophy of perception. Po-92 Truth and Evidence: A Study of Husserl‟s Theory of Truth Yushi Kajio Department of Philosophy, Tohoku University Abstract: The purpose of this presentation is to clarify the relationship between evidence and truth. In Husserl‘s theory of truth, the concept of truth is inseparably connected with the special aspect of the experience referred to as ‗evidence‘. Thus, it appears inappropriate for Husserl to suppose an absolute ‗truth‘ that is separated from experience, and to pose the metaphysical question of what it is we refer to as ‗truth‘? Then, what kind of questions should we ask with regard to the concept of truth? Here, I wish to answer by proposing the following ‗question‘ instead: How can an empirical subject obtain universal validity of its own judgment through the concept of truth? More accurately, in this presentation I will adapt a phenomenological description from a first-person perspective. This allows me to clarify the way truth has a normative effect on experience. To begin with, the epistemic value of truth will be shown by comparing phenomenological ideas with pragmatism. Then, a common understanding that regards evidence as a kind of ‗Ideation‘ will be introduced. Finally, in order to criticize such form of essentialism I will focus on Husserl‘s transcendental turn, which reveals the interaction between truth and evidence. Yet, at the same time, in this presentation, I will emphasize the | 109 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” normative-regulative function of truth in order to reject those who insist that Husserl‘s transcendental turn represents evidence for his idealism. Po-93 Hume on the Analyticity on „Relations of Idea‟ Hiromichi Sugawara Graduate School of Arts and Letters, Tohoku University Abstract: As is commonly known, the 18th century Scottish philosopher David Hume has divided all objects of human reasoning or inquiry into ‗relations of ideas‘ and ‗matters of fact‘. Here the former refers to the sort of reasoning employed in arithmetic or algebra, and whose validity can be logically warranted, while it does not depend on the notion of how things exist in the world. Meanwhile, the latter concept refers the subject used in causation or identity which belongs to the probability and which can be conceived as a belief obtained by such subject which proves false in the light of the world. Essentially, we can refer to these two notions of reasoning as an analytic-synthetic distinction. Thus, from the perspective of modern philosophy, my presentation, firstly, attempts to reveal what kind of analyticity Hume has developed in his work. Here, I argue that the key to our understanding can be sought in Hume‘s transition which has occurred from his treatment of geometry, his first work A Treatise of Human Nature to its partial revision in An Enquiry concerning Human Understanding. Analyticity here must surely be considered together with the correlative concept of syntheticity. Thus, my secondary concern in this presentation rests with Hume‘s understanding of the difference between laws of natural philosophy and the axioms or theorems in the field of mathematics. At all events, these problems are embodied in the very human phenomena and are therefore related to our skills, as well as the ability, and understandings to employ these skills. Po-94 In Dialogue with Nature: A Core-text General Education Course Bridging Science and Humanity Ka Wai CHAN, Wing Hung WONG, Chi Wang CHAN, Wai Man SZETO Office of University General Education The Chinese University of Hong Kong Shatin, Hong Kong Abstract In 2010/2011, The Chinese University of Hong Kong has introduced into the undergraduate curriculum a compulsory General Education Foundation Programme (GEFP), which comprises the courses, ―In Dialogue with Nature‖ and ―In Dialogue with Humanity‖. ―In Dialogue with Nature‖ is a core-text general education course, 110 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium which is composed of three parts, namely, ―Human Exploration of the Physical Universe‖, ―Human Exploration of the World of Life‖ and ―Our Understanding of Human Understanding‖. Through reading and discussing classic texts written by great minds like Newton, Darwin, Poincaré and Schrödinger, students will not only gain an understanding of Nature, but will also build up a dialogue between science and humanity as Schrödinger does in his Mind and Matter that he has found a connection between evolution and division of labour. Brief accounts of the background, content and implementation of the course, and Schrödinger‘s example are shown in the poster. Po-95 Merging Features and Optical-NIR Color Gradient of Early-type Galaxies Duho Kim Seoul National University It has been suggested that merging plays an important role in the formation and the evolution of early-type galaxies. Optical-NIR color gradients of early-type galaxies in high density environments are found to be less steep than those in low density environment, hinting frequent merger activities in early-type galaxies in high density environment. In order to examine if the flat color gradient is the result of dry merger, we studied the relations between merging feature, color gradient, and environment of 286 low redshift early-type galaxies selected from SDSS Stripe82. The sample contains 227 relaxed, 38 tidal feature, 10 dust feature, 11 tidal and dust feature and 4 interacting galaxies, and NIR images are taken from UKIDSS LAS. We find that r-K color gradients of field galaxies are steeper than those of cluster environment. Relatively large number of galaxies with peculiar features contribute to the steeper color gradients in the field environment. This implies that in high density environment, early-type galaxies are already evolved and relaxed, resulting flat color gradients. However in low density environment, some of early-type galaxies undergone merging recently which makes the color gradient steep. Po-96 Correlation between galaxy mergers and AGN activity Jueun Hong Seoul National University It is believed that active galactic nuclei (AGN) is powered by super massive black hole (SMBH). But how the AGN activity is triggered is still unclear. Some studies suggest that gas inflow by merging can trigger AGN activity. However, it is difficult to find observational evidence because merging features such as tidal tail, shell are faint. Using images taken at Maidanak 1.5m telescope and CFHT, we investigated whether merging features are seen | 111 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” commonly on AGN host galaxies. We found that 3 to 4 of the currently studied 6 AGN show features disturbed by gravitational interaction. This result implies that AGN activity correlates with merging. We plan to expand the sample size in the near future. Po-97 Measurement of X-Rays from Ξ−Atom in J-PARC Seongbae Yang Department of Physics and Astronomy, Seoul National University, Korea Abstract: This presentation is an introduction of ―Measurement of X-Rays from Ξ−Atom‖ experiment that will be performed at Japan Proton Accelerator Research Complex(J-PARC). The purpose is to measure Ξ−nucleus optical potential by observing X-rays from atom, and thus to obtain information on baryon-baryon interaction for S=-2 sector. Ξ−Atom is produced by the (K-,K+) reaction. K− is provided by K1.8 beamline at J-PARC and identified by time-of–flight counters and Cherenkov counters. Produced Ξ−atom is stopped by the target, and K+ is detected by KURAMA spectrometer. X-rays from Ξ-atom is measured by Hyperball-J that is commonly used for -ray measurement of hypernuclei. Po-98 The Raman Study Of Hydrazine Monohydrate Under High Pressure ShuQing Jiang JiLin University Abstract : The Raman Spectroy of N2H4.H2O has been studied from the pressure of 0 GP to 23.5GP ,We have observed that the liquid hydrate crystallized on 4GP, the new structure of Hydrazine Monohydrate is stable relatively until 23.5GP.We studied the change condition of each peak position with the increased of pressure and compared it to other hydrate.More complexed phenomenons had been observed in the experiment. Po-99 New high pressure phase of GeH3 Pugeng Hou Jilin University First-principles pseudopotential calculations have been performed to investigate the structures, electronic structure and electron-phonon interaction like MH4, with M=Ge, C, Si, Sn,. The calculated results show that GeH3 is 112 | February 17 (Thu) - February 19 (Sat), 2011 The 3rd GCOE International Symposium mechanically stable. We got several structures of GeH3, and one of them, the CCCM structures is the lowest energy structure. The Superconducting transition temperature TC is in working. Po-100 Po-105 Precision measurement of Little Higgs with T-parity parameters at the International Linear Collider. Eriko Kato Department of Physics,Tohoku. University Abstract In my session, I will address the measurement accuracy of the heavy gauge bosons, heavy leptons and it‘s parameters that Littlest Higgs Model with T-parity imposes at ILC. ILC is a next-generation particle accelerator and because of its capability of high precision measurements, it is an ideal place to verify new physics beyond the Standard Model. The Littlest Higgs Model with T-parity is one of the attractive candidates of physics beyond the Standard Model. One of the important predictions of the model is the existence of new heavy gauge bosons, where they acquire mass terms through the breaking of global symmetry necessarily imposed on the model. Together with measurements of heavy leptons we can determine the entire parameters that describe the model in the lepton and gauge boson sector. Through Flavor tagging, lepton identification and other studies I was able to determine the measurement accuracy of the Little Higgs Parameters. Po-106 | 113 Tohoku University Scienceweb GCOE “Weaving Science Web beyond Particle-Matter Hierarchy” Memo 114 |