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7th International Particle accelerator Conference, IPAC 2016

作者： Li, C.L. Xu, Y.H. Boland, M.J. Mitsuhashi, T. Zhang, W.J. Grinberg, M. Corbett, J. East China University of Science and Technology Shanghai China Donghua University Shanghai China Synchrotron Light Source Australia Clayton Australia KEK Tsukuba Japan University of Saskatchewan Saskatoon Canada SLAC National Accelerator Laboratory Menlo Park United States

ISBN: (纸本)9783954501472

The resolution of a conventional telescope used to image visible-light synchrotron radiation is often limited by diffraction effects. To improve resolution, the doubleslit interferometer method was developed at KEK and has since become popular around the world. Based on the Van Cittert-Zernike theorem relating transverse source profile to transverse spatial coherence, the particle beam size can be inferred by recording fringe contrast as a function of interferometer slit separation. In this paper, we describe the SPEAR3 double-slit interferometer, develop a theoretical framework for the interferometer and provide experimental results. Of note the double-slit system is 'rotated' about the beam axis to map the dependence of photon beam coherence on angle. Copyright © 2016 CC-BY-3.0 and by the respective authors.

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2D Transition Metal Dichalcogenide: Unraveling High-Yield Phase-Transition Dynamics in Transition Metal Dichalcogenides on Metallic Substrates (Adv. Sci. 7/2019)

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Advanced science 2019年第7期6卷 1970042-1970042页

作者： Xinmao Yin Chi Sin Tang Di Wu Weilong Kong Changjian Li Qixing Wang Liang Cao Ming Yang Yung-Huang Chang Dianyu Qi Fangping Ouyang Stephen J. Pennycook Yuan Ping Feng Mark B. H. Breese Shi Jie Wang Wenjing Zhang Andrivo Rusydi Andrew T. S. Wee Department of Physics Faculty of Science National University of Singapore Singapore 117542 Singapore Singapore Synchrotron Light Source (SSLS) National University of Singapore Singapore 117603 Singapore NUS Graduate School for Integrative Sciences and Engineering National University of Singapore Singapore 117456 Singapore International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Shenzhen University Shenzhen 518060 China Hunan Key Laboratory of Super-microstructure and Ultrafast Process School of Physics and Electronics Central South University No. 932 South Lushan Road Changsha Hunan Province 410083 China Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of Sciences Hefei 230031 China Institute of Materials Research and Engineering A∗STAR (Agency for Science Technology and Research) 2 Fusionopolis Way Singapore 138634 Singapore Bachelor Program in Interdisciplinary Studies National Yunlin University of Science and Technology Yunlin 640 Taiwan

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Using Scanning Transmission X-ray Microscopy to Reveal the Origin of Lithium Compositional Spatiodynamics in Battery Materials

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Microscopy and Microanalysis 2017年第S1期23卷 888-889页

作者： Jongwoo Lim Yiyang Li Daan Hein Alsem Hongyun So Sang Chul Lee Peng Bai Daniel A. Cogswell Xuzhao Liu Norman Jin Young-sang Yu Department of Materials Science and Engineering Stanford University Stanford CA USA. Stanford Institute for Materials & Energy Sciences SLAC National Accelerator Laboratory Menlo Park CA USA Hummingbird Scientific Lacey WA USA. Department of Aeronautics and Astronautics Stanford University Stanford CA USA. Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley CA USA

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Photoemission study of the electronic structure of valence band convergent SnSe

arXiv

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arXiv 2018年

作者： Wang, C.W. Xia, Y.Y.Y. Tian, Z. Jiang, J. Li, B.H. Cui, S.T. Yang, H.F. Liang, A.J. Zhan, X.Y. Hong, G.H. Liu, S. Chen, C. Wang, M.X. Yang, L.X. Liu, Z. Mi, Q.X. Li, G. Xue, J.M. Liu, Z.K. Chen, Y.L. Center for Excellence in Superconducting Electronics State Key Laboratory of Functional Material for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China School of Physical Science and Technology ShanghaiTech University CAS-Shanghai Science Research Center Shanghai200031 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai201800 China University of Chinese Academy of Sciences Beijing100049 China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Pohang Accelerator Laboratory POSTECH Pohang790-784 Korea Republic of Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai200050 China Collaborative Innovation Center of Quantum Matter Beijing China State Key Laboratory of Low Dimensional Quantum Physics Department of Physics and Collaborative Innovation Center of Quantum Matter Tsinghua University Beijing100084 China Department of Physics University of Oxford OxfordOX1 3PU United Kingdom

IV-VI semiconductor SnSe has been known as the material with record high thermoelectric performance. The multiple close-to-degenerate (or "convergent") valence bands in the electronic band structure has been one of the key factors contributing to the high power factor and thus figure-of-merit in the SnSe single crystal. Up to date, there has been only theoretical calculations but no experimental observation of this particular electronic band structure. In this paper, using Angle-Resolved Photoemission Spectroscopy, we performed a systematic investigation on the electronic structure of SnSe. We directly observe three predicted hole bands with small energy differences between their band tops and relatively small in-plane effective masses, in good agreement with the ab-initio calculations and critical for the enhancement of the Seebeck coefficient while keeping high electrical conductivity. Our results reveal the complete band structure of SnSe for the first time, and help to provide a deeper understanding of the electronic origin of the excellent thermoelectric performances in SnSe. Copyright © 2018, The Authors. All rights reserved.

关键词： Tin compounds

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Spectral Evidence for Emergent Order in Ba1−xNaxFe2As2

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Physical Review Letters 2018年第12期121卷 127001-127001页

作者： M. Yi A. Frano D. H. Lu Y. He Meng Wang B. A. Frandsen A. F. Kemper R. Yu Q. Si L. Wang M. He F. Hardy P. Schweiss P. Adelmann T. Wolf M. Hashimoto S.-K. Mo Z. Hussain M. Le Tacon A. E. Böhmer D.-H. Lee Z.-X. Shen C. Meingast R. J. Birgeneau Department of Physics University of California Berkeley Berkeley California 94720 USA Department of Physics and Astronomy Rice University Houston Texas 77005 USA Advanced Light Source Lawrence Berkeley National Lab Berkeley California 94720 USA Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo Park California 94025 USA Stanford Institute of Materials and Energy Sciences Stanford University Stanford California 94305 USA Departments of Physics and Applied Physics and Geballe Laboratory for Advanced Materials Stanford University Stanford California 94305 USA School of Physics Sun Yat-Sen University Guangzhou 510275 China Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics North Carolina State University Raleigh North Carolina 27695 USA Department of Physics Renmin University of China Beijing 100872 China Institute for Solid State Physics Karlsruhe Institute of Technology 76021 Karlsruhe Germany Kirchhoff-Institute for Physics Universitt Heidelberg D-69120 Heidelberg Germany Department of Materials Science and Engineering University of California Berkeley California 94720 USA

We report an angle-resolved photoemission spectroscopy study of the iron-based superconductor family, Ba1−xNaxFe2As2. This system harbors the recently discovered double-Q magnetic order appearing in a reentrant C4 phase deep within the underdoped regime of the phase diagram that is otherwise dominated by the coupled nematic phase and collinear antiferromagnetic order. From a detailed temperature-dependence study, we identify the electronic response to the nematic phase in an orbital-dependent band shift that strictly follows the rotational symmetry of the lattice and disappears when the system restores C4 symmetry in the low temperature phase. In addition, we report the observation of a distinct electronic reconstruction that cannot be explained by the known electronic orders in the system.

关键词： Unconventional superconductors Angle-resolved photoemission spectroscopy

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Revealing the Coulomb interaction strength in a cuprate superconductor

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Physical Review B 2017年第24期96卷 245112-245112页

作者： S.-L. Yang J. A. Sobota Y. He Y. Wang D. Leuenberger H. Soifer M. Hashimoto D. H. Lu H. Eisaki B. Moritz T. P. Devereaux P. S. Kirchmann Z.-X. Shen Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park California 94025 USA Geballe Laboratory for Advanced Materials Departments of Physics and Applied Physics Stanford University Stanford California 94305 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park California 94025 USA Electronics and Photonics Research Institute National Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki 305-8558 Japan

We study optimally doped Bi2Sr2Ca0.92Y0.08Cu2O8+δ (Bi2212) using angle-resolved two-photon photoemission spectroscopy. Three spectral features are resolved near 1.5, 2.7, and 3.6 eV above the Fermi level. By tuning the photon energy, we determine that the 2.7-eV feature arises predominantly from unoccupied states. The 1.5- and 3.6-eV features reflect unoccupied states whose spectral intensities are strongly modulated by the corresponding occupied states. These unoccupied states are consistent with the prediction from a cluster perturbation theory based on the single-band Hubbard model. Through this comparison, a Coulomb interaction strength U of 2.7 eV is extracted. Our study complements equilibrium photoemission spectroscopy and provides a direct spectroscopic measurement of the unoccupied states in cuprates. The determined Coulomb U indicates that the charge-transfer gap of optimally doped Bi2212 is 1.1 eV.

关键词： Electronic structure High-temperature superconductors Strongly correlated systems Perturbation theory Photoemission spectroscopy

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Properties of synchrotron radiation from segmented undulators based on a Wigner distribution function 7

Properties of synchrotron radiation from segmented undulator...

引用

7th International Particle accelerator Conference, IPAC 2016

作者： Luo, H.W. Chung, T.Y. Lee, C.H. Hwang, C.S. Graduate Program in Science and Technology of Synchrotron Light Source National Tsing Hua University Hsinchu Taiwan National Synchrotron Radiation Research Center Hsinchu Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan Department of Electrophysics National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)9783954501472

Three long straight sections with a double mini-βylattice were designed in Taiwan Photon source. For the purpose to understand whether the brilliance can be enhanced or not when two collinear undulators were installed in the double mini-βysection. The method of Wigner distribution function (WDF) is a natural way to describe a synchrotron radiation source. The brilliance is thereby calculable without a Gaussian approximation used in a conventional manner. Hence the WDF is developed to calculate the brilliance for the two collinear undulators in the double mini-βysection. Some important optical properties such as the degree of coherence can be directly calculated with this method. We use it as an example to investigate the properties of radiation from a segmented undulator. Copyright © 2016 CC-BY-3.0 and by the respective authors.

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Photoproduction of Λ and Σ0 hyperons off protons with linearly polarized photons at Eγ=1.5–3.0 GeV

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Physical Review C 2018年第1期97卷 015208-015208页

作者： S. H. Shiu H. Kohri W. C. Chang D. S. Ahn J. K. Ahn J. Y. Chen S. Daté H. Ejiri H. Fujimura M. Fujiwara S. Fukui W. Gohn K. Hicks T. Hotta S. H. Hwang K. Imai T. Ishikawa K. Joo Y. Kato Y. Kon H. S. Lee Y. Maeda T. Mibe M. Miyabe K. Mizutani Y. Morino N. Muramatsu T. Nakano Y. Nakatsugawa M. Niiyama H. Noumi Y. Ohashi T. Ohta M. Oka J. D. Parker C. Rangacharyulu S. Y. Ryu T. Sawada H. Shimizu Y. Sugaya M. Sumihama T. Tsunemi M. Uchida M. Ungaro M. Yosoi Institute of Physics Academia Sinica Taipei 11529 Taiwan Department of Physics National Central University Taoyuan City 32001 Taiwan Research Center for Nuclear Physics Osaka University Ibaraki Osaka 567-0047 Japan RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198 Japan Department of Physics Korea University Seoul 02841 Republic of Korea Light Source Division National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Japan Synchrotron Radiation Research Institute Sayo Hyogo 679-5143 Japan Wakayama Medical College Wakayama 641-8509 Japan National Institutes for Quantum and Radiological Science and Technology Tokai Ibaraki 319-1195 Japan Department of Physics University of Connecticut Storrs Connecticut 06269-3046 USA Department of Physics and Astronomy Ohio University Athens Ohio 45701 USA Korea Research Institute of Standards and Science (KRISS) Daejeon 34113 Republic of Korea Advanced Science Research Center Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Research Center for Electron Photon Science Tohoku University Sendai Miyagi 982-0826 Japan Kobayashi-Maskawa Institute Nagoya University Nagoya Aichi 464-8602 Japan Rare Isotope Science Project Institute for Basic Science Daejeon 34047 Korea Proton Therapy Center Fukui Prefectural Hospital Fukui 910-8526 Japan High Energy Accelerator Organization (KEK) Tsukuba Ibaraki 305-0801 Japan Department of Physics Kyoto University Kyoto 606-8502 Japan Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Department of Radiology The University of Tokyo Hospital Tokyo 113-8655 Japan Neutron Science and Technology Center Comprehensive Research Organization for Science and Society (CROSS) Tokai Ibaraki 319-1106 Japan Department of Physics and Engineering Physics University of Saskatchewan Saskatoon SK S7N 5E2 Canada Physics Department University of Michigan Michigan 48109-1040 USA Department of Education Gifu University Gifu 501-1193 Japan Gr

We report the measurement of the γp→K+Λ and γp→K+Σ0 reactions at SPring-8. The differential cross sections and photon-beam asymmetries are measured at forward K+ production angles using linearly polarized tagged-photon beams in the range of Eγ=1.5–3.0 GeV. With increasing photon energy, the cross sections for both γp→K+Λ and γp→K+Σ0 reactions decrease slowly. Distinct narrow structures in the production cross section have not been found at Eγ=1.5–3.0 GeV. The forward peaking in the angular distributions of cross sections, a characteristic feature of t-channel exchange, is observed for the production of Λ in the whole observed energy range. A lack of similar feature for Σ0 production reflects a less dominant role of t-channel contribution in this channel. The photon-beam asymmetries remain positive for both reactions, suggesting the dominance of K* exchange in the t channel. These asymmetries increase gradually with the photon energy, and have a maximum value of +0.6 for both reactions. Comparison with theoretical predictions based on the Regge trajectory in the t channel and the contributions of nucleon resonances indicates the major role of t-channel contributions as well as non-negligible effects of nucleon resonances in accounting for the reaction mechanism of hyperon photoproduction in this photon energy regime.

关键词： Particle production Photonuclear reactions Polarization phenomena

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Revealing the Coulomb interaction strength in a cuprate superconductor

arXiv

引用

arXiv 2017年

作者： Yang, S.-L. Sobota, J.A. He, Y. Wang, Y. Leuenberger, D. Soifer, H. Hashimoto, M. Lu, D.H. Eisaki, H. Moritz, B. Devereaux, T.P. Kirchmann, P.S. Shen, Z.-X. Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo ParkCA94025 United States Geballe Laboratory for Advanced Materials Departments of Physics and Applied Physics Stanford University StanfordCA94305 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo ParkCA94025 United States Electronics and Photonics Research Institute National Institute of Advanced Industrial Science and Technology TsukubaIbaraki305-8558 Japan

We study optimally doped Bi2Sr2Ca0.92Y0.08Cu2O8+δ (Bi2212) using angle-resolved two-photon photoemission spectroscopy. Three spectral features are resolved near 1.5, 2.7, and 3.6 eV above the Fermi level. By tuning the photon energy, we determine that the 2.7 eV feature arises predominantly from unoccupied states. The 1.5 and 3.6 eV features reflect unoccupied states whose spectral intensities are strongly modulated by the corresponding occupied states. These unoccupied states are consistent with the prediction from a cluster perturbation theory based on the single-band Hubbard model. Through this comparison, a Coulomb interaction strength U of 2.7 eV is extracted. Our study complements equilibrium photoemission spectroscopy and provides a direct spectroscopic measurement of the unoccupied states in cuprates. The determined Coulomb U indicates that the charge-transfer gap of optimally doped Bi2212 is 1.1 eV. Copyright © 2017, The Authors. All rights reserved.

关键词： Charge transfer

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Current-driven dynamics and inhibition of the skyrmion Hall effect of ferrimagnetic skyrmions in GdFeCo films

arXiv

引用

arXiv 2017年

作者： Woo, Seonghoon Song, Kyung Mee Zhang, Xichao Zhou, Yan Ezawa, Motohiko Liu, Xiaoxi Finizio, S. Raabe, J. Lee, Nyun Jong Kim, Sang-Il Park, Seung-Young Kim, Younghak Kim, Jae-Young Lee, Dongjoon Lee, OukJae Choi, Jun Woo Min, Byoung-Chul Koo, Hyun Cheol Chang, Joonyeon Center for Spintronics Korea Institute of Science and Technology Seoul02792 Korea Republic of Department of Physics Sookmyung Women’s University Seoul04130 Korea Republic of School of Science and Engineering Chinese University of Hong Kong Shenzhen518172 China Department of Applied Physics University of Tokyo Hongo 7-3-1 Tokyo113-8656 Japan Department of Electrical and Computer Engineering Shinshu University Wakasato 4-17-1 Nagano380-8553 Japan Swiss Light Source Paul Scherrer Institut Villigen5232 Switzerland Spin Engineering Physics Team Division of Scientific Instrumentation Korea Basic Science Institute Daejeon305-806 Korea Republic of Pohang Accelerator Laboratory Pohang University of Science and Technology Pohang37673 Korea Republic of KU-KIST Graduate School of Converging Science and Technology Korea University Seoul02792 Korea Republic of Department of Nanomaterials Science and Engineering Korea University of Science and Technology Daejeon34113 Korea Republic of

Magnetic skyrmions are swirling magnetic textures with novel characteristics suitable for future spintronic and topological applications. Recent studies confirmed the room-temperature stabilization of skyrmions in ultrathin ferromagnets. However, such ferromagnetic skyrmions show undesirable topological effect, the skyrmion Hall effect, which leads to their current-driven motion towards device edges, where skyrmions could easily be annihilated by topographic defects. Recent theoretical studies have predicted enhanced current-driven behaviour for antiferromagnetically exchange-coupled skyrmions. Here we present the stabilization of these skyrmions and their current-driven dynamics in ferrimagnetic GdFeCo films. By utilizing element-specific X-ray imaging, we find that the skyrmions in the Gd and FeCo sublayers are antiferromagnetically exchange-coupled. We further confirm that ferrimagnetic skyrmions can move at a velocity of ~50 m s-1 with reduced skyrmion Hall angle, θSkHE ~20°. Our findings open the door to ferrimagnetic and antiferromagnetic skyrmionics while providing key experimental evidences of recent theoretical studies. Copyright © 2017, The Authors. All rights reserved.

关键词： Iron alloys

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