Graphene: Is It the Future for Semiconductors? an Overview of the Material, Devices, and Applications by Yaw Obeng and Purushothaman Srinivasan
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Allan Hugh Macdonald Date and Place of Birth
10/31/2014 CURRICULUM VITAE ALLAN H. MACDONALD Full name: Allan Hugh MacDonald Date and place of birth: December 1, 1951 Antigonish, Nova Scotia, Canada Citizenships: Canadian and American Present address: 2519 Harris Boulevard Austin, Texas 78703 USA Phone (512) 495-9192 Institutional affiliation: The University of Texas at Austin Austin, Texas 78712 Phone (512) 232-9113 FAX (512) 471-9621 e-mail: [email protected] Title: Sid W. Richardson Foundation Regents Chair Field of Specialization: Condensed Matter Theory Employment: September 1973 -- April 1978 Ph.D. Student University of Toronto May 1978 -- October 1980 Research Associate --- National Research Council November 1980 -- June 1982 Assistant Research Officer -- National Research Council of Canada August 1982 -- August 1987 Associate Research Officer --- National Research Council of Canada September 1987 -- August 1992 Professor of Physics --- Indiana University September 1992 -- August 2000 Distinguished Professor of Physics --- Indiana University September 2000 -- present Sid W. Richardson Foundation Regents Chair --- The University of Texas at Austin 1 10/31/2014 Scholarships and Honors: President's Scholarship, St. Francis Xavier University, 1969–1973 Governor-General's Medal, St. Francis Xavier University, 1973 (Highest academic standing in graduating class) NSERC 1967 Science Scholarship, University of Toronto, 1973–1977 Herzberg Medal, 1987 (Awarded by the Canadian Association of Physicists) Fellow of the American Physical Society, 1989 Sid W. Richardson Foundation Regents -
Graphite Materials for the U.S
ANRIC your success is our goal SUBSECTION HH, Subpart A Timothy Burchell CNSC Contract No: 87055-17-0380 R688.1 Technical Seminar on Application of ASME Section III to New Materials for High Temperature Reactors Delivered March 27-28, 2018, Ottawa, Canada TIM BURCHELL BIOGRAPHICAL INFORMATION Dr. Tim Burchell is Distinguished R&D staff member and Team Lead for Nuclear Graphite in the Nuclear Material Science and Technology Group within the Materials Science and Technology Division of the Oak Ridge National Laboratory (ORNL). He is engaged in the development and characterization of carbon and graphite materials for the U.S. Department of Energy. He was the Carbon Materials Technology (CMT) Group Leader and was manager of the Modular High Temperature Gas-Cooled Reactor Graphite Program responsible for the research project to acquire reactor graphite property design data. Currently, Dr. Burchell is the leader of the Next Generation Nuclear Plant graphite development tasks at ORNL. His current research interests include: fracture behavior and modeling of nuclear-grade graphite; the effects of neutron damage on the structure and properties of fission and fusion reactor relevant carbon materials, including isotropic and near isotropic graphite and carbon-carbon composites; radiation creep of graphites, the thermal physical properties of carbon materials. As a Research Officer at Berkeley Nuclear Laboratories in the U.K. he monitored the condition of graphite moderators in gas-cooled power reactors. He is a Battelle Distinguished Inventor; received the Hsun Lee Lecture Award from the Chinese Academy of Science’s Institute of Metals Research in 2006 and the ASTM D02 Committee Eagle your success is our goal Award in 2015. -
Moiré Band Topology in Twisted Bilayer Graphene
Moiré Band Topology in Twisted Bilayer Graphene Chao Ma, † Qiyue Wang, ‡ Scott Mills,§ Xiaolong Chen, †# Bingchen Deng, † Shaofan Yuan, † Cheng Li, † Kenji Watanabe, || Takashi Taniguchi, || Du Xu, *§ Fan Zhang, *‡ and Fengnian Xia*† †Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA ‡Department of Physics, The University of Texas at Dallas, Richardson, TX 7508, USA §Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY11794, USA ||National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan 1 ABSTRACT Recently twisted bilayer graphene (t-BLG) emerges as a new strongly correlated physical platform near a magic twist angle, which hosts many exciting phenomena such as the Mott-like insulating phases, unconventional superconducting behavior and emergent ferromagnetism. Besides the apparent significance of band flatness, band topology may be another critical element in determining strongly correlated twistronics yet receives much less attention. Here we report compelling evidence for nontrivial noninteracting band topology of t-BLG moiré Dirac bands through a systematic nonlocal transport study, in conjunction with an examination rooted in K- theory. The moiré band topology of t-BLG manifests itself as two pronounced nonlocal responses in the electron and hole superlattice gaps. We further show that the nonlocal responses are robust to the interlayer electric field, twist angle, and edge termination, exhibiting a universal scaling law. While an unusual symmetry of t-BLG trivializes Berry curvature, we elucidate that two Z2 invariants characterize the topology of the moiré Dirac bands, validating the topological edge origin of the observed nonlocal responses. Our findings not only provide a new perspective for understanding the emerging strongly correlated phenomena in twisted van der Waals heterostructures, but also suggest a potential strategy to achieve topologically nontrivial metamaterials from topologically trivial quantum materials based on twist engineering. -
LNCMI Annual Report 2014
2014 PUBLICATIONS List of Publications 2014 [1] B. Albertazzi, A. Ciardi, M. Nakatsutsumi, T. Vinci, J. B´eard,R. Bonito, J. Billette, M. Borghesi, Z. Burkley, S. N. Chen, T. E. Cowan, T. Herrmannsd¨orfer,D. P. Higginson, F. Kroll, S. A. Pikuz, K. Naughton, L. Romagnani, C. Riconda, G. Revet, R. Riquier, H.-P. Schlenvoigt, I. Yu. Skobelev, A.Ya. Faenov, A. Soloviev, M. Huarte- Espinosa, A. Frank, O. Portugall, H. P´epin, and J. Fuchs, \Laboratory formation of a scaled protostellar jet by coaligned poloidal magnetic field,” Science 346, 325{328 (2014). [2] Jack A. Alexander-Webber, Clement Faugeras, Piotr Kossacki, Marek Potemski, Xu Wang, Hee Dae Kim, Samuel D. Stranks, Robert A. Taylor, and Robin J. Nicholas, \Hyperspectral Imaging of Exciton Photoluminescence in Individual Carbon Nanotubes Controlled by High Magnetic Fields," Nano Letters 14, 5194{5200 (2014). [3] Rami Al-Oweini, Bassem S. Bassil, Jochen Friedl, Veronika Kottisch, Masooma Ibrahim, Marie Asano, Bineta Keita, Ghenadie Novitchi, Yanhua Lan, Annie Powell, Ulrich Stimming, and Ulrich Kortz, \Synthesis and Characterization of Multinuclear Manganese-Containing Tungstosilicates," Inorganic Chemistry 53, 5663{5673 (2014). [4] K. Andersson, M. Hammerstad, A. B. Tomter, H. Hersleth, A. K. Rohr, G. Zoppellaro, N. H. Andersen, G. K. Sandvik, G. E. Nilsson, A. Anne-Laure Barra, M. Hogbom, and A. Graslund, \Studies of the tyrosyl radicals and metal clusters in R2 of class la and lb ribonucleotide reductase," Journal Of Biological Inorganic Chemistry 19, S266 (2014). [5] A. Audouard, L. Drigo, F. Duc, X. Fabreges, L. Bosseaux, and P. Toulemonde, \Tunnel diode oscillator mea- surements of the upper critical magnetic field of FeTe0:5Se0:5," Journal of Physics-Condensed Matter 26, 185701 (2014). -
Exploring the Electrical Properties of Twisted Bilayer Graphene
Linfield University DigitalCommons@Linfield Senior Theses Student Scholarship & Creative Works 5-2019 Exploring the Electrical Properties of Twisted Bilayer Graphene William Shannon Linfield College Follow this and additional works at: https://digitalcommons.linfield.edu/physstud_theses Part of the Condensed Matter Physics Commons, Energy Systems Commons, Engineering Physics Commons, Materials Science and Engineering Commons, and the Power and Energy Commons Recommended Citation Shannon, William, "Exploring the Electrical Properties of Twisted Bilayer Graphene" (2019). Senior Theses. 45. https://digitalcommons.linfield.edu/physstud_theses/45 This Thesis (Open Access) is protected by copyright and/or related rights. It is brought to you for free via open access, courtesy of DigitalCommons@Linfield, with permission from the rights-holder(s). Your use of this Thesis (Open Access) must comply with the Terms of Use for material posted in DigitalCommons@Linfield, or with other stated terms (such as a Creative Commons license) indicated in the record and/or on the work itself. For more information, or if you have questions about permitted uses, please contact [email protected]. Exploring the Electrical Properties of Twisted Bilayer Graphene William Shannon A THESIS Presented to the Department of Physics LINFIELD COLLEGE McMinnville, Oregon In partial fulfillment of the requirements for the Degree of BACHELOR OF SCIENCE May, 2019 THESIS COPYRIGHT PERMISSIONS Pleaseread this document carefully before signing. If you have questions about any of these permissions,please contact the DigitalCommonsCoordinator. Title of the Thesis: Exploring the Electrical Properties of Twisted Bilayer Graphene Author's Name: (Last name, first name) Shannon, William111 Advisor's Name DigitalCommons@Linfield(DC@L) is our web-based, open access-compliantinstitutional repository for digital content produced by Linfield faculty, students, staff, and their collaborators. -
Critical Point for Bose–Einstein Condensation of Excitons in Graphite
Critical point for Bose–Einstein condensation of excitons in graphite Jinhua Wanga,b , Pan Niea,b , Xiaokang Lia,b, Huakun Zuoa,b, Benoˆıt Fauque´ c, Zengwei Zhua,b,1 , and Kamran Behniad aWuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China; bSchool of Physics, Huazhong University of Science and Technology, Wuhan 430074, China; cJeunes Equipes´ de l’Institut de Physique, Unite´ Mixte de Service et de Recherche 3573, CNRS, College` de France, Paris Sciences et Lettres Research University, 75231 Paris Cedex 05, France; and dLaboratoire de Physique et d’Etude´ des Materiaux,´ CNRS, Ecole´ Superieure´ de Physique et de Chimie Industrielles Paris, Paris Sciences et Lettres Research University, 75005 Paris, France Edited by Zachary Fisk, University of California, Irvine, CA, and approved October 15, 2020 (received for review June 22, 2020) An exciton is an electron–hole pair bound by attractive Coulomb nature of EI unexpected in the alternative Peierls-driven charge interaction. Short-lived excitons have been detected by a vari- density wave (CDW) (9). Other indirect signatures of BEC ety of experimental probes in numerous contexts. An excitonic transition have been reported in two-dimensional systems, such insulator, a collective state of such excitons, has been more elu- as quantum wells (11), graphene (12–14), and transition metal sive. Here, thanks to Nernst measurements in pulsed magnetic dichalcogenides heterostructures (15, 16). fields, we show that in graphite there is a critical temperature Here, we present the case of graphite subject to strong mag- (T = 9.2 K) and a critical magnetic field (B = 47 T) for Bose–Einstein netic field where the existence of a thermodynamic phase transi- condensation of excitons. -
The Era of Carbon Allotropes Andreas Hirsch
commentary The era of carbon allotropes Andreas Hirsch Twenty-five years on from the discovery of 60C , the outstanding properties and potential applications of the synthetic carbon allotropes — fullerenes, nanotubes and graphene — overwhelmingly illustrate their unique scientific and technological importance. arbon is the element in the periodic consist of extended networks of sp3- and 1985, with the advent of fullerenes (Fig. 1), table that provides the basis for life sp2 -hybridized carbon atoms, respectively. which were observed for the first time by Con Earth. It is also important for Both forms show unique physical properties Kroto et al.3. This serendipitous discovery many technological applications, ranging such as hardness, thermal conductivity, marked the beginning of an era of synthetic from drugs to synthetic materials. This lubrication behaviour or electrical carbon allotropes. Now, as we celebrate role is a consequence of carbon’s ability conductivity. Conceptually, many other buckminsterfullerene’s 25th birthday, it is to bind to itself and to nearly all elements ways to construct carbon allotropes are also the time to reflect on a growing family in almost limitless variety. The resulting possible by altering the periodic binding of synthetic carbon allotropes, which structural diversity of organic compounds motif in networks consisting of sp3-, sp2- includes the synthesis of carbon nanotubes and molecules is accompanied by a broad and sp-hybridized carbon atoms1,2. As a in 19914 and the rediscovery of graphene range of -
Nanoelectronics: Nanoribbons on the Edge
news & views abThis work on graphene nanopores is Add DNA certain to be the precursor to further studies in a variety of fields. Within the scope of nanopore sensing, there are numerous 1 ns avenues to explore using the graphene 0.2 s itself as an electrode to control the local electric potential and translocation rates, or c to monitor the transverse conductance of individual nucleotides as they pass through a pore9. Previous theoretical work suggests that the latter technique, if used in the proper geometry, could provide DNA sequencing 10 1 ns with a 0% error rate . Combined with recent 2 ms advances in the production of large-area high-quality graphene (sheets with up to a ++ + 30-inch diagonal)4, the results open the door ––– to a host of interesting explorations including the development of new membrane systems Figure 2 | Translocation of DNA through a graphene nanopore. a, Double-stranded DNA threading a for biosensing. ❐ graphene nanopore. Each coloured segment represents a different nucleotide. The software VMD 1.8.7, PyMOL1.2r1, and TubeGen 3.3 was used in preparation of the image. b, Characteristic conductance versus Zuzanna S. Siwy and Matthew Davenport are in the time signals of a graphene nanopore before and after the addition of DNA. c, The conductance signature Department of Physics and Astronomy, University of (top) of various DNA conformations (bottom) as they translocate through a graphene nanopore. Parts b California, Irvine, California 92697, USA. and c reproduced with permission from ref. 7, © 2010 ACS. e-mail: [email protected] References 1. Dekker, C. -
Chemistry with Graphene and Graphene Oxide - Challenges for Synthetic Chemists Siegfried Eigler* and Andreas Hirsch*
Chemistry with Graphene and Graphene Oxide - Challenges for Synthetic Chemists Siegfried Eigler* and Andreas Hirsch* Dr. Siegfried Eigler*, Prof. Dr. Andreas Hirsch* Department of Chemistry and Pharmacy and Institute of Advanced Materials and Processes (ZMP) Henkestrasse 42, 91054 Erlangen and Dr.-Mack Strasse 81, 90762 Fürth (Germany) Fax: (+49) 911-6507865015 E-mail: [email protected]; [email protected] The chemical production of graphene as well as its controlled wet- chemical modification is a challenge for synthetic chemists and the characterization of reaction products requires sophisticated analytic methods. In this review we first describe the structure of graphene and graphene oxide. We then outline the most important synthetic methods which are used for the production of these carbon based nanomaterials. We summarize the state-of-the-art for their chemical functionalization by non-covalent and covalent approaches. We put special emphasis on the differentiation of the terms graphite, graphene, graphite oxide and graphene oxide. An improved fundamental knowledge about the structure and the chemical properties of graphene and graphene oxide is an important prerequisite for the development of practical applications. 1. Introduction: Graphene and Graphene Oxide – Opportunities and Challenges for Synthetic Chemists Research into graphene and graphene oxide (GO) represents an emerging field of interdisciplinary science spanning a variety of disciplines including chemistry, physics, materials science, device fabrication and -
Closed Network Growth of Fullerenes
ARTICLE Received 9 Jan 2012 | Accepted 18 Apr 2012 | Published 22 May 2012 DOI: 10.1038/ncomms1853 Closed network growth of fullerenes Paul W. Dunk1, Nathan K. Kaiser2, Christopher L. Hendrickson1,2, John P. Quinn2, Christopher P. Ewels3, Yusuke Nakanishi4, Yuki Sasaki4, Hisanori Shinohara4, Alan G. Marshall1,2 & Harold W. Kroto1 Tremendous advances in nanoscience have been made since the discovery of the fullerenes; however, the formation of these carbon-caged nanomaterials still remains a mystery. Here we reveal that fullerenes self-assemble through a closed network growth mechanism by incorporation of atomic carbon and C2. The growth processes have been elucidated through experiments that probe direct growth of fullerenes upon exposure to carbon vapour, analysed by state-of-the-art Fourier transform ion cyclotron resonance mass spectrometry. Our results shed new light on the fundamental processes that govern self-assembly of carbon networks, and the processes that we reveal in this study of fullerene growth are likely be involved in the formation of other carbon nanostructures from carbon vapour, such as nanotubes and graphene. Further, the results should be of importance for illuminating astrophysical processes near carbon stars or supernovae that result in C60 formation throughout the Universe. 1 Department of Chemistry and Biochemistry, Florida State University, 95 Chieftan Way, Tallahassee, Florida 32306, USA. 2 Ion Cyclotron Resonance Program, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA. 3 Institut des Matériaux Jean Rouxel, CNRS UMR 6502, Université de Nantes, BP32229 Nantes, France. 4 Department of Chemistry and Institute for Advanced Research, Nagoya University, Nagoya 464-8602, Japan. -
Geometric and Electronic Properties of Graphene-Related Systems: Chemical Bondings Arxiv:1702.02031V2 [Physics.Chem-Ph] 13
Geometric and electronic properties of graphene-related systems: Chemical bondings Ngoc Thanh Thuy Trana, Shih-Yang Lina;∗, Chiun-Yan Lina, Ming-Fa Lina;∗ aDepartment of Physics, National Cheng Kung University, Tainan 701, Taiwan February 14, 2017 Abstract This work presents a systematic review of the feature-rich essential properties in graphene-related systems using the first-principles method. The geometric and electronic properties are greatly diversified by the number of layers, the stacking con- figurations, the sliding-created configuration transformation, the rippled structures, and the distinct adatom adsorptions. The top-site adsorptions can induce the signif- icantly buckled structures, especially for hydrogen and fluorine adatoms. The elec- tronic structures consist of the carbon-, adatom- and (carbon, adatom)-dominated energy bands. There exist the linear, parabolic, partially flat, sombrero-shaped and oscillatory band, accompanied with various kinds of critical points. The semi-metallic or semiconducting behaviors of graphene systems are dramatically changed by the multi- or single-orbital chemical bondings between carbons and adatoms. Graphene oxides and hydrogenated graphenes possess the tunable energy gaps. Fluorinated graphenes might be semiconductors or hole-doped metals, while other halogenated systems belong to the latter. Alkali- and Al-doped graphenes exhibit the high-density free electrons in the preserved Dirac cones. The ferromagnetic spin configuration is revealed in hydrogenated and halogenated graphenes under certain distributions. Specifically, Bi nano-structures are formed by the interactions between monolayer arXiv:1702.02031v2 [physics.chem-ph] 13 Feb 2017 graphene and buffer layer. Structure- and adatom-enriched essential properties are compared with the measured results, and potential applications are also discussed. -
Reduction Kinetics of Graphene Oxide Determined by Electrical Transport Measurements and Temperature Programmed Desorption
J. Phys. Chem. C XXXX, xxx, 000 A Reduction Kinetics of Graphene Oxide Determined by Electrical Transport Measurements and Temperature Programmed Desorption Inhwa Jung,† Daniel A. Field,‡ Nicholas J. Clark,‡ Yanwu Zhu,† Dongxing Yang,† Richard D. Piner,† Sasha Stankovich,§ Dmitriy A. Dikin,§ Heike Geisler,| Carl A. Ventrice, Jr.,*,‡ and Rodney S. Ruoff*,† Department of Mechanical Engineering and the Texas Materials Institute, UniVersity of Texas at Austin, Austin, Texas, 78712, Department of Physics, Texas State UniVersity, San Marcos, Texas, 78666, Department of Mechanical Engineering, Northwestern UniVersity, EVanston, Illinois, 60208, and Insitute for EnVironmental and Industrial Science, Texas State UniVersity, San Marcos, Texas, 78666 ReceiVed: May 11, 2009; ReVised Manuscript ReceiVed: August 31, 2009 The thermal stability and reduction kinetics of graphene oxide were studied by measuring the electrical resistivity of single-layer graphene films at various stages of reduction in high vacuum and by performing temperature programmed desorption (TPD) measurements of multilayer films in ultrahigh vacuum. The graphene oxide was exfoliated from the graphite oxide source material by slow-stirring in aqueous solution, which produces single-layer platelets with an average lateral size of ∼10 µm. From the TPD measurements, it was determined that the primary desorption products of the graphene oxide films for temperatures up to 300 °C are H2O, CO2, and CO, with only trace amounts of O2 being detected. Resistivity measurements on individual single-layer graphene oxide platelets resulted in an activation energy of 37 ( 1 kcal/mol. The TPD measurements of multilayer films of graphene oxide platelets give an activation energy of 32 ( 4 kcal/mol. 1.