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1 Distinct Band Reconstructions in Kagome Superconductor Csv3sb5
Distinct band reconstructions in kagome superconductor CsV3Sb5 Yang Luo1,#, Shuting Peng1,#, Samuel M. L. Teicher2,#, Linwei Huai1,#, Yong Hu1,3, Brenden R. Ortiz2, Zhiyuan Wei1, Jianchang Shen1, Zhipeng Ou1, Bingqian Wang1, Yu Miao1, Mingyao Guo1, M. Shi3, Stephen D. Wilson2 and J.-F. He1,* 1Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, Anhui 230026, China 2Materials Department and California Nanosystems Institute, University of California Santa Barbara, Santa Barbara, California 93106, USA 3Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland #These authors contributed equally to this work. *To whom correspondence should be addressed: [email protected] The new two-dimensional (2D) kagome superconductor CsV3Sb5 has attracted much recent attention due to the coexistence of superconductivity, charge order, topology and kagome physics [1- 33]. A key issue in this field is to unveil the unique reconstructed electronic structure, which successfully accommodates different orders and interactions to form a fertile ground for emergent phenomena. Here, we report angle-resolved photoemission spectroscopy (ARPES) evidence for two distinct band reconstructions in CsV3Sb5. The first one is characterized by the appearance of new electron energy band at low temperature. The new band is theoretically reproduced when the three dimensionality of the charge order [21-23] is considered for a band-folding along the out-of-plane direction. The second reconstruction is identified as a surface induced orbital-selective shift of the electron energy band. Our results provide the first evidence for the three dimensionality of the charge order in single-particle spectral function, highlighting the importance of long-range out-of-plane electronic correlations in this layered kagome superconductor. -
Color Centers in Additively Colored Csbr David W
Physics and Astronomy Publications Physics and Astronomy 9-1962 Color Centers in Additively Colored CsBr David W. Lynch Iowa State University, [email protected] Follow this and additional works at: http://lib.dr.iastate.edu/physastro_pubs Part of the Atomic, Molecular and Optical Physics Commons, and the Optics Commons The ompc lete bibliographic information for this item can be found at http://lib.dr.iastate.edu/physastro_pubs/8. For information on how to cite this item, please visit http://lib.dr.iastate.edu/howtocite.html. This Article is brought to you for free and open access by the Physics and Astronomy at Iowa State University Digital Repository. It has been accepted for inclusion in Physics and Astronomy Publications by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. Color Centers in Additively Colored CsBr Abstract Color centers have been studied in CsBr single crystals additively colored with potassium or cesium. More than ten absorption bands were produced, most of which had previously been found in crystals colored by ionizing radiation. All bands produced by irradiation at or above liquid nitrogen temperature appear to arise from trapped electrons. The most prominent bands in the additively colored crystals are the F band at 642 mμ (liquid nitrogen temperature) and a band at 243 mμ which appears to be due to an impurity. Optically bleaching the F band at 200°K produces bands analogous to the M and R bands in other alkali halides while bleaching at liquid nitrogen temperature yields a broad band identified as the F′ band. -
Far Infrared Vibration-Rotation-Tunneling Spectroscopy and Internal Dynamics of Methane-Water: a Prototypical Hydrophobic System L
Far infrared vibration-rotation-tunneling spectroscopy and internal dynamics of methane-water: A prototypical hydrophobic system L. Dore,a) R. C. Cohen,b) C. A. Schmuttenmaer,c) K. L. Busarow, M. J. Elrod, J. G. Loeser, and R. J. Saykally Department of Chemistry, University of California, Berkeley, California 94720 (Received 26 March 1993; accepted 1 October 1993) Thirteen vibration-rotation-tunneling (VRT) bands of the CH4-H,O complex have been mea- sured in the range from 18 to 35.5 cm-’ using tunable far infrared laser spectroscopy. The ground state has an average center of mass separation of 3.70 A and a stretching force constant of 1.52 N/m, indicating that this complex is more strongly bound than Ar-H,O. The eigenvalue spectrum has been calculated with a variational procedure using a spherical expansion of a site-site ab i&o intermolecular potential energy surface [J. Chem. Phys. 93, 7808 ( 1991)]. The computed eigenvalues exhibit a similar pattern to the observed spectra but are not in quantita- tive agreement. These observations suggest that both monomers undergo nearly free internal rotation within the complex. I. INTRODUCTION order terms in the IPS, whereas they are usually neglected when the more typical low order terms are present. Water-hydrophobe interactions govern essential fea- This study and the accompanying microwave (MW) tures of many chemical and biochemical processes. Con- work’ constitute the first spectroscopic studies of this clus- siderable controversy exists in the literature concerning the ter; in fact it is only within the last 3 years that any high correct molecular description of the macroscopic phenom- resolution spectra for methane containing complexes have ena commonly associated with hydrophobic interactions been reported. -
Recent Progress on Extended Wavelength and Split-Off Band
micromachines Review Recent Progress on Extended Wavelength and Split-Off Band Heterostructure Infrared Detectors Hemendra Ghimire 1, P. V. V. Jayaweera 2 , Divya Somvanshi 3, Yanfeng Lao 4 and A. G. Unil Perera 1,* 1 Center for Nano-Optics (CeNo), Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30033, USA; [email protected] 2 SPD Laboratory, Inc., Hamamatsu 432-8011, Japan; [email protected] 3 Department of Electronics and Tele-Communication Engineering, Jadavpur University, Kolkata 700032, India; [email protected] 4 Hisense Photonics, Inc., 5000 Hadley Road, South Plainfield, NJ 07080, USA; [email protected] * Correspondence: [email protected] Received: 21 April 2020; Accepted: 20 May 2020; Published: 28 May 2020 Abstract: The use of multilayer semiconductor heterojunction structures has shown promise in infrared detector applications. Several heterostructures with innovative compositional and architectural designs have been displayed on emerging infrared technologies. In this review, we aim to illustrate the principles of heterostructure detectors for infrared detection and explore the recent progress on the development of detectors with the split-off band and threshold wavelength extension mechanism. This review article includes an understanding of the compositional and the architectural design of split-off band detectors and to prepare a database of their performances for the wavelength extension mechanism. Preparing a unique database of the compositional or architectural design of structures, their performance, and penetrating the basics of infrared detection mechanisms can lead to significant improvements in the quality of research. The brief outlook of the fundamentals of the infrared detection technique with its appropriateness and limitations for better performance is also provided. -
Maritime Radar Performance
Solid State Navigation and Situation Awareness Radar Radar 2008 1904 1948- present 19001900 19501950 20002000 Origins of Commercial Marine Radar Kelvin Hughes New Marine Radar 1948 Type 1 • First UK Type Approved Marine Radar – 11th August 1948 • Specification – Upmast Transmitter/Receiver – Antenna Rotation: 30RPM – Peak Power:- 30kW – RF Frequency:- 9.434GHz - 9.524GHz – PRF:- 1kHz – Pulse Width: 0.2μs – Azimuth Beamwidth:- 1.5° – Elevation Beamwidth:- 27° Sensor Improvements Advances in Sensor Technology Low Noise Front Ends FET Modulators Improved Magnetron Life Current Sensors at Peak of Performance However……… Magnetron - Short Pulse Spectrum Little improvement in 0 performance in clutter -10 -20 Customers & Regulators -30 -40 demand detection of smaller -50 targets -60 Power (dBc/Hz) Power -70 Customers want more reliable -80 -90 systems -100 2 4 6 8 10 12 14 16 Frequency (GHz) Pressure from ITU to restrict radar bandwidth and out of band emissions SharpEye Introduction • First ‘New Technology’ Marine Navigation Radar for 60 years • Conforms to requirements of IMO & IEC • ‘Family’ of Products – Built-in Flexibility through design and part selection – Considered future enhancements during concept/design phase – 100% PV Funded Development • Performance/Cost Trade-Off – Minimum performance IEC 62388 (new radar standard - July 2008) • More performance expected but not at expense of production cost/quality • Achieve performance through innovation – Economies of scale • Re-use of components/sub-assemblies throughout product range • Reliability and Maintainability high on our priorities SharpEye World’s 1st Solid State Marine Navigation Radar Features include: •Solid state transmitter •Coherent transmitter and receiver •Pulse compression •Digital signal processing •Interference suppression •Low voltage operation What sets Sharpeye apart • Incorporates advantages in semi-conductor based radars but at a cost that competes with conventional magnetron systems • Sharpeye incorporates low power RF architecture. -
THE ULTRAVIOLET, OPTICAL, and INFRARED PROPERTIES of SLOAN DIGITAL SKY SURVEY SOURCES DETECTED by GALEX Marcel A
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Columbia University Academic Commons The Astronomical Journal, 130:1022–1036, 2005 September A # 2005. The American Astronomical Society. All rights reserved. Printed in U.S.A. THE ULTRAVIOLET, OPTICAL, AND INFRARED PROPERTIES OF SLOAN DIGITAL SKY SURVEY SOURCES DETECTED BY GALEX Marcel A. Agu¨eros,1,2 Zˇ eljko Ivezic´,1 Kevin R. Covey,1 Mirela Obric´,3 Lei Hao,4 Lucianne M. Walkowicz,1 Andrew A. West,1 Daniel E. Vanden Berk,5 Robert H. Lupton,6 Gillian R. Knapp,6 James E. Gunn,6 Gordon T. Richards,6 John Bochanski, Jr.,1 Alyson Brooks,1 Mark Claire,1 Daryl Haggard,1 Nathan Kaib,1 Amy Kimball,1 Stephanie M. Gogarten,1 Anil Seth,1 and Michael Solontoi1 Received 2004 December 6; accepted 2005 May 16 ABSTRACT We discuss the ultraviolet, optical, and infrared properties of the Sloan Digital Sky Survey (SDSS) sources detected by the Galaxy Evolution Explorer (GALEX ) as part of its All-sky Imaging Survey Early Release Ob- servations. Virtually all (>99%) the GALEX sources in the overlap region are detected by SDSS; those without an SDSS counterpart within our 600 search radius are mostly unflagged GALEX artifacts. GALEX sources represent 2.5% of all SDSS sources within these fields, and about half are optically unresolved. Most unresolved GALEX- SDSS sources are bright (r < 18 mag), blue, turnoff, thick-disk stars and are typically detected only in the GALEX near-ultraviolet (NUV) band. The remaining unresolved sources include low-redshift quasars (z < 2:2), white dwarfs, and white dwarf–M dwarf pairs, and these dominate the optically unresolved sources detected in both GALEX bands. -
Unlicensed, Wireless, Transport SMPTE292M, Video Using V-Band MMW
Unlicensed, Wireless, Transport SMPTE292M, Video using V-Band MMW by Dave Russell, MMW Radio Product-Line Manager HXI, LLC. Contact HXI at 978-521-7300 ext. 7304 for more information. Forward Once the exclusive realm of scientific research and military use, wireless systems operating in the upper millimeter wave (MMW) regions are now providing cost-effective solutions for high-capacity commercial data transport needs. While MMW technology is nothing new, the growing volume of commercial use with associated economies of scale has significantly reduced system costs, making MMW systems more attractive to the general consumer. The unique attributes of MMW signal propagation, combined with the scarcity of RF spectrum at lower frequencies, assures that the proliferation of MMW systems and their effect on daily life will continue. This article examines the unique attributes of signal propagation in the MMW region. The goal of this analysis is to provide the reader with a general, working knowledge to make informed decisions when considering MMW solutions. A dual channel SMPTE292M wireless transport system is used as a characteristic example of a commercial MMW application. This system demonstrates the capacity benefits of MMW techniques by providing roughly 3Gbps of raw HDTV production video throughput in an unlicensed band. The Upper MMW Spectrum The millimeter wave spectrum is defined as that region above microwave where the signal wavelength falls within the range of 1 to 0.1mm. Because of the direct relationship between signal frequency and signal wavelength, signal frequencies from 30-300GHz are defined as millimeter wave frequencies. The millimeter wave spectrum is also identified by IEEE established letter designations. -
Atp-01, Volume Ii Allied Maritime Tactical Signal and Maneuvering Book
NATO UNCLASSIFIED ATP-01, Vol. II NATO STANDARD ATP-01, VOLUME II ALLIED MARITIME TACTICAL SIGNAL AND MANEUVERING BOOK Edition (G) Version (1) JANUARY 2016 NORTH ATLANTIC TREATY ORGANIZATION ALLIED TACTICAL PUBLICATION Published by the NATO STANDARDIZATION OFFICE (NSO) © NATO/OTAN MAY BE CARRIED IN MILITARY AIRCRAFT 0410LP1158006 I EDITION (G) VERSION (1) NATO UNCLASSIFIED NATO UNCLASSIFIED ATP-01, Vol. II ALPHABETICAL AND NUMERAL FLAGS FLAG FLAG FLAG and Spoken Writtenand Spoken Writtenand Spoken Written NAME NAME NAME MIKE ALFA A M YANKEE Y A M Y NOVEMBER BRAVO B N ZULU Z B N Z C OSCAR O 1 CHARLIE ONE C O ONE DELTAD PAPA P TWO 2 D P TWO ECHOE QUEBEC Q THREE 3 E Q THREE FOXTROTF ROMEO R FOUR 4 F R FOUR GOLFG SIERRA S FIVE 5 G S FIVE 6 HOTELH TANGO T SIX H T SIX 7 INDIAI UNIFORM U SEVEN I U SEVEN JULIETTJ VICTOR V EIGHT 8 J V EIGHT KILOK WHISKEY W NINE 9 K W NINE LIMAL XRAY X ZERO 0 L X ZERO II EDITION (G) VERSION (1) NATO UNCLASSIFIED NATO UNCLASSIFIED ATP-01, Vol. II January 2016 PUBLICATION NOTICE 1. ATP-01(G)(1), Volume II, ALLIED MARITIME TACTICAL SIGNAL AND MANEUVERING BOOK, is effective upon receipt. It supersedes ATP-01(F)(1), Volume II. 2. Summary of changes: a. Chapter 1: Updates chapter with information from MTP-01(F)(1). b. Figures 1-5, 1-6, and 1-7 updated to refl ect information from MTP-01(F)(1). c. Chapter 2: Updates Signal Flags and Pennants table. -
Polycyclic Aromatic Hydrocarbons in Protoplanetary Disks: Emission and X-Ray Destruction
A&A 543, A25 (2012) Astronomy DOI: 10.1051/0004-6361/201219039 & c ESO 2012 Astrophysics Polycyclic aromatic hydrocarbons in protoplanetary disks: emission and X-ray destruction R. Siebenmorgen1 and F. Heymann2 1 European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching b. München, Germany e-mail: [email protected] 2 Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506-0055, USA Received 14 February 2012 / Accepted 13 April 2012 ABSTRACT We study the polycyclic aromatic hydrocarbon (PAH) emission from protoplanetary disks. First, we discuss the dependence of the PAH band ratios on the hardness of the absorbed photons and the temperature of the stars. We show that the photon energy together with a varying degree of the PAH hydrogenation accounts for most of the observed PAH band ratios without the need to change the ionization degree of the molecules. We present an accurate treatment of stochastic heated grains in a vectorized three dimensional Monte Carlo dust radiative transfer code. The program is verified against results using ray tracing techniques. Disk models are presented for T Tauri and Herbig Ae stars. Particular attention is given to the photo-dissociation of the molecules. We consider beside PAH destruction also the survival of the molecules by vertical mixing within the disk. By applying typical X-ray luminosities the model accounts for the low PAH detection probability observed in T Tauri and the high PAH detection statistics found in Herbig Ae disks. Spherical halos above the disks are considered. We show that halos reduce the observed PAH band-to-continuum ratios when observed at high inclination. -
G-Band Waveguide to Microstrip Transition for MMIC Integration
Donadio, Oberdan (2012) G-band waveguide to microstrip transition for MMIC integration. PhD thesis. http://theses.gla.ac.uk/3354/ Copyright and moral rights for this thesis are retained by the author A copy can be downloaded for personal non-commercial research or study, without prior permission or charge This thesis cannot be reproduced or quoted extensively from without first obtaining permission in writing from the Author The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the Author When referring to this work, full bibliographic details including the author, title, awarding institution and date of the thesis must be given Glasgow Theses Service http://theses.gla.ac.uk/ [email protected] G-band Waveguide to Microstrip Transition for MMIC Integration by Oberdan Donadio Thesis submitted in fulfilment of the requirements for the degree of Doctor of Philosophy in the School of Engineering College of Science and Engineering January 2012 Declaration of Authorship I, Oberdan Donadio, declare that this thesis titled, `G-band Waveguide to Microstrip Transition for MMIC Integration' and the work presented in it are my own. I confirm that: This work was done wholly or mainly while in candidature for a research degree at the University of Glasgow. Where any part of this thesis has previously been submitted for a degree or any other qualification at this University or any other institution, this has been clearly stated. Where I have consulted the published work of others, this is always clearly at- tributed. Where I have quoted from the work of others, the source is always given. -
Green to Blue-Green Quartz from Rakowice Wielkie (Sudetes, South-Western Poland) – a Re-Examination of Prasiolite-Related Colour Varieties of Quartz
MINERALOGIA, 46, No 1-2: 19-28 (2015) DOI: 10.1515/mipo-2016-0004 www.Mineralogia.pl MINERALOGICAL SOCIETY OF POLAND POLSKIE TOWARZYSTWO MINERALOGICZNE Original paper Green to blue-green quartz from Rakowice Wielkie (Sudetes, south-western Poland) – a re-examination of prasiolite-related colour varieties of quartz Alexej N. Platonov1, Adam Szuszkiewicz2* 1 Institute of Geochemistry, Mineralogy and Ore Formation, Academy of Science of Ukraine, Palladina 34, 252 680 Kiev-142, Ukraine 2 Institute of Geological Sciences, University of Wrocław, 50-204 Wrocław, pl. M. Borna 9, Poland e-mail: [email protected] * Corresponding author Received: March 9, 2016 Received in revised form: April 26, 2016 Accepted: May 26, 2016 Available online: September 25, 2016 Abstract. The green colour of prasiolite, defined as naturally occurring transparent macrocrystalline α-quartz with primary colouration, results from the optical absorption centred at ∼13,660 cm-1 and attributed to the 2+ 3+ FeVI →FeVI intervalence charge transfer (Platonov et al. 1992). However, optical absorption spectroscopy of blue-green to green quartz from Rakowice Wielkie, Sudetes, south-western Poland, shows that its primary colouration results from the combination of this band and absorptions at ∼18,500 cm-1 and ∼16,250 cm-1. The first 4+ 3+ - 2+ 3+ - is assigned to a hole centre Fe s(Fe s-e ) combined with an electron centre Fe I6(Fe I6+e ), while the second from 4- -1 -1 AlO4 defects. The quartz is blue-green if the 18,500 cm prevails and becomes pale green if the 16,250 cm band predominates. -
Performance Comparison of S-Band, C-Band, and X-Band RF Linac Based Xfels
ICFA FLS2012 Workshop, Newport News, USA THz image Performance Comparison of S-band, C-band, and X-band RF Linac based XFELs Yujong Kim†, S. Saitiniyazi, M. Mayierjiang M. Titberidze, T. Andrews, and C. Eckman Idaho State University, Pocatello, ID 83209, USA †Jefferson Lab, Newport News, VA 23606, USA [email protected], http:// www.isu.edu/~yjkim ISU-JLAB-2012-039 Outline Acknowledgements Energy Chirp, FEL Bandwidth, and Stability Issue in Compact XFELs S-band based XFEL Driving Linac Short-Range Wakefields Chirp Control with RF Phase, RF Amplitude, and No RF feeding Chirper C-band based XFEL Driving Linac X-band based XFEL Driving Linac Performance Comparison of S-band, C-band, and X-band XFEL Linacs Possible RF Systems Sensitivities of RF Jitters Sensitivities of Alignment Errors Nonlinearities in Longitudinal Phase Space Several Directions for Stable Compact XFEL Driving Linac Summary 2 Yujong Kim @ Idaho State University and Thomas Jefferson National Accelerator Facility, USA Acknowledgements Y. Kim sincerely give his thanks to following friends, references, and former supervisors for their fruitful discussions and encouragements on this work: SPring-8: Prof. T. Shintake (now OIST) and Dr. T. Inagaki MHI & Toshiba: Mr. Sadao Miura (MHI) and Mr. Osamu Yushiro (Toshiba) KEK: Prof. K. Yokoya and Prof. H. Matsumoto PSI: Dr. S. Reiche, Dr. M. Pedrozzi, Dr. H. Braun, Dr. T. Garvey, Dr. J.-Y. Raguin, and Dr. M. Dehler SLAC: Dr. J. Wu, Dr. Yipeng Sun, Dr. C. Adolphsen, Prof. T. Raubenheimer, and Dr. Z. Huang DESY: Dr. K. Floettmann (ASTRA) APS: Dr. M. Borland (ELEGANT) and Prof. Kwang-Je Kim LANL: Dr.