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Carrier-Density-Dependent Lattice Stability in InSb

Physical Review Letters 2007年第12期98卷 125501-125501页

作者： P. B. Hillyard K. J. Gaffney A. M. Lindenberg S. Engemann R. A. Akre J. Arthur C. Blome P. H. Bucksbaum A. L. Cavalieri A. Deb R. W. Falcone D. M. Fritz P. H. Fuoss J. Hajdu P. Krejcik J. Larsson S. H. Lee D. A. Meyer A. J. Nelson R. Pahl D. A. Reis J. Rudati D. P. Siddons K. Sokolowski-Tinten D. von der Linde J. B. Hastings Department of Chemistry Stanford University Stanford California 94305 USA PULSE Center Stanford Linear Accelerator Center Menlo Park California 94025 USA Stanford Synchrotron Radiation Laboratory/SLAC Menlo Park California 94025 USA Stanford Linear Accelerator Center Menlo Park California 94025 USA Deutsches Elektronen-Synchrotron DESY Notkestrasse 85 22607 Hamburg Germany FOCUS Center Department of Physics and Applied Physics Program University of Michigan Ann Arbor Michigan 48109 USA Max-Planck-Institute of Quantum Optics Hans-Kopfermann-Strasse 1 D-85748 Garching Germany Department of Physics University of California Berkeley California 94720 USA Materials Science Division Argonne National Laboratory Argonne Illinois 60439 USA Department of Cell and Molecular Biology Biomedical Centre Uppsala University SE-75124 Uppsala Sweden Department of Physics Lund Institute of Technology P.O. Box 118 S-22100 Lund Sweden Length/Time Metrology Group Korea Institute of Standards and Science Daejeon 305-600 Republic of Korea Lawrence Livermore National Laboratory Livermore California 94550 USA Consortium for Advanced Radiation Sources The University of Chicago Chicago Illinois 60637 USA Advanced Photon Source Argonne National Laboratory Argonne Illinois 60439 USA National Synchrotron Light Source Brookhaven National Laboratory Upton New York 11973 USA Institut für Experimentelle Physik Universität Duisberg-Essen D-45117 Essen Germany

The ultrafast decay of the x-ray diffraction intensity following laser excitation of an InSb crystal has been utilized to observe carrier dependent changes in the potential energy surface. For the first time, an abrupt carrier dependent onset for potential energy surface softening and the appearance of accelerated atomic disordering for a very high average carrier density have been observed. Inertial dynamics dominate the early stages of crystal disordering for a wide range of carrier densities between the onset of crystal softening and the appearance of accelerated atomic disordering.

关键词： Semiconducting indium compounds

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Two-step electronic response to magnetic ordering in a van der Waals ferromagnet

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Physical Review B 2024年第4期109卷 045416-045416页

作者： Han Wu Jian-Xin Zhu Lebing Chen Matthew W. Butcher Ziqin Yue Dongsheng Yuan Yu He Ji Seop Oh Bin Gao Jianwei Huang Shan Wu Cheng Gong Yucheng Guo Sung-Kwan Mo Jonathan Denlinger Donghui Lu Makoto Hashimoto Matthew B. Stone Alexander I. Kolesnikov Songxue Chi Junichiro Kono Andriy H. Nevidomskyy Robert J. Birgeneau Pengcheng Dai Ming Yi Department of Physics and Astronomy and Rice Center for Quantum Materials Rice University Houston Texas 77005 USA Theoretical Division Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Center for Integrated Nanotechnologies Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Physics University of California at Berkeley Berkeley California 94720 USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas 77005 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA National Institute for Materials Science 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan Department of Applied Physics Yale University New Haven Connecticut 06511 USA Department of Electrical and Computer Engineering and Quantum Technology Center University of Maryland College Park Maryland 20742 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo Park California 94025 USA Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Electrical and Computer Engineering Rice University Houston Texas 77005 USA Smalley-Curl Institute Rice University Houston Texas 77005 USA Department of Material Science and Nanoengineering Rice University Houston Texas 77005 USA Department of Materials Science and Engineering University of California Berkeley California 94720 USA

The two-dimensional material Cr2Ge2Te6 is a member of the class of insulating van der Waals (vdW) magnets. Here, using high resolution angle-resolved photoemission spectroscopy in a detailed temperature dependence study, we identify a clear response of the electronic structure to a dimensional crossover in the form of two distinct temperature scales marking onsets of modifications in the electronic structure. Specifically, we observe Te p-orbital-dominated bands to undergo changes at the Curie transition temperature TC while the Cr d-orbital-dominated bands begin evolving at a higher temperature scale. Combined with neutron scattering, density functional theory calculations, and Monte Carlo simulations, we find that the electronic system can be consistently understood to respond sequentially to the distinct temperatures at which in-plane and out-of-plane spin correlations exceed a characteristic length scale. Our findings reveal the sensitivity of the orbital-selective electronic structure for probing the dynamical evolution of local moment correlations in vdW insulating magnets.

关键词： Electronic structure Magnetic order Magnetic phase transitions Van der Waals systems Angle-resolved photoemission spectroscopy

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X-Ray Diffuse Scattering Measurements of Nucleation Dynamics at Femtosecond Resolution

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Physical Review Letters 2008年第13期100卷 135502-135502页

作者： A. M. Lindenberg S. Engemann K. J. Gaffney K. Sokolowski-Tinten J. Larsson P. B. Hillyard D. A. Reis D. M. Fritz J. Arthur R. A. Akre M. J. George A. Deb P. H. Bucksbaum J. Hajdu D. A. Meyer M. Nicoul C. Blome Th. Tschentscher A. L. Cavalieri R. W. Falcone S. H. Lee R. Pahl J. Rudati P. H. Fuoss A. J. Nelson P. Krejcik D. P. Siddons P. Lorazo J. B. Hastings PULSE Center Stanford Linear Accelerator Center Menlo Park California 94025 USA Stanford University Department of Materials Science and Engineering Stanford California 94305 USA Stanford Synchrotron Radiation Laboratory/SLAC Menlo Park California 94025 USA* Institut für Experimentelle Physik Universität Duisberg-Essen D-45117 Essen Germany Department of Physics Lund Institute of Technology P.O. Box 118 S-22100 Lund Sweden Department of Chemistry Stanford University Stanford California 94305 USA FOCUS Center Department of Physics and Applied Physics Program University of Michigan Ann Arbor Michigan 48109 USA Stanford Linear Accelerator Center Menlo Park California 94025 USA Department of Cell and Molecular Biology Biomedical Centre Uppsala University SE-75124 Uppsala Sweden Stanford University Department of Chemistry Stanford California 94305 USA Deutsches Elektronen-Synchrotron DESY Notkestrasse 85 22607 Hamburg Germany Max-Planck-Institute of Quantum Optics Hans-Kopfermann-Str. 1 D-85748 Garching Germany Department of Physics University of California Berkeley California 94720 USA Length/Time Metrology Group Korea Research Institute of Standards and Science Daejeon 305-600 Republic of Korea Consortium for Advanced Radiation Sources The University of Chicago Chicago Illinois 60637 USA Advanced Photon Source Argonne National Laboratory Argonne Illinois 60439 USA Materials Science Division Argonne National Laboratory Argonne Illinois 60439 USA Physics Department Lawrence Livermore National Laboratory Livermore California 94550 USA National Synchrotron Light Source Brookhaven National Laboratory Upton New York 11973 USA Departement de Genie Physique Ecole Polytechnique de Montreal C.P. 6079 Succursale Centre-Ville Montreal (Quebec) Canada H3C 3A7

Femtosecond time-resolved small and wide angle x-ray diffuse scattering techniques are applied to investigate the ultrafast nucleation processes that occur during the ablation process in semiconducting materials. Following intense optical excitation, a transient liquid state of high compressibility characterized by large-amplitude density fluctuations is observed and the buildup of these fluctuations is measured in real time. Small-angle scattering measurements reveal snapshots of the spontaneous nucleation of nanoscale voids within a metastable liquid and support theoretical predictions of the ablation process.

关键词： Ultrashort pulses

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Direct momentum imaging of charge transfer following site-selective ionization

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Physical Review A 2023年第4期108卷 043113-043113页

作者： Felix Allum Yoshiaki Kumagai Kiyonobu Nagaya James Harries Hiroshi Iwayama Mathew Britton Philip H. Bucksbaum Michael Burt Mark Brouard Briony Downes-Ward Taran Driver David Heathcote Paul Hockett Andrew J. Howard Jason W. L. Lee Yusong Liu Edwin Kukk Joseph W. McManus Dennis Milsesevic Akinobu Niozu Johannes Niskanen Andrew J. Orr-Ewing Shigeki Owada Patrick A. Robertson Artem Rudenko Kiyoshi Ueda James Unwin Claire Vallance Tiffany Walmsley Russell S. Minns Daniel Rolles Michael N. R. Ashfold Ruaridh Forbes Chemistry Research Laboratory Department of Chemistry University of Oxford Oxford OX1 3TA UK PULSE Institute SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park California 94025 USA Linac Coherent Light Source SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park California 94025 USA Department of Applied Physics Tokyo University of Agriculture and Technology Tokyo Japan Department of Physics Kyoto University Kyoto 606-8502 Japan QST SPring-8 Kouto 1-1-1 Sayo Hyogo Japan Institute for Molecular Science Okazaki 444-8585 Japan Sokendai (The Graduate University for Advanced Studies) Okazaki 444-8585 Japan School of Chemistry University of Southampton Highfield Southampton SO17 1BJ UK National Research Council of Canada 100 Sussex Dr. Ottawa ON K1A 0R6 Canada Deutsches Elektronen-Synchrotron DESY Hamburg Germany Department of Physics and Astronomy University of Turku FI-20014 Turku Finland Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima 739-8526 Japan School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK RIKEN SPring-8 Center Sayo Hyogo 679-5148 Japan Japan Synchrotron Radiation Research Institute Sayo Hyogo 679-5198 Japan J.R. Macdonald Laboratory Department of Physics Kansas State University Manhattan Kansas 66506 USA Department of Chemistry Tohoku University Sendai 980-8578 Japan

We study ultrafast charge rearrangement in dissociating 2-iodopropane (2−C3H7I) using site-selective core ionization at the iodine atom. Clear signatures of electron transfer between the neutral propyl fragment and multiply charged iodine ions are observed in the recorded delay-dependent ion momentum distributions. The detected charge-transfer pathway is only favorable within a small (few angstroms), charge-state-dependent spatial window located at C-I distances longer than that of the neutral ground-state molecule. These results offer insights into the physics underpinning charge transfer in isolated molecules and pave the way for a different class of time-resolved studies.

关键词： Autoionization & Auger processes Electronic excitation & ionization Electronic structure of atoms & molecules Multiphoton or tunneling ionization & excitation Photoemission Single- and few-photon ionization & excitation Ultrafast phenomena

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Clocking Femtosecond X Rays

引用

Physical Review Letters 2005年第11期94卷 114801-114801页

作者： A. L. Cavalieri D. M. Fritz S. H. Lee P. H. Bucksbaum D. A. Reis J. Rudati D. M. Mills P. H. Fuoss G. B. Stephenson C. C. Kao D. P. Siddons D. P. Lowney A. G. MacPhee D. Weinstein R. W. Falcone R. Pahl J. Als-Nielsen C. Blome S. Düsterer R. Ischebeck H. Schlarb H. Schulte-Schrepping Th. Tschentscher J. Schneider O. Hignette F. Sette K. Sokolowski-Tinten H. N. Chapman R. W. Lee T. N. Hansen O. Synnergren J. Larsson S. Techert J. Sheppard J. S. Wark M. Bergh C. Caleman G. Huldt D. van der Spoel N. Timneanu J. Hajdu R. A. Akre E. Bong P. Emma P. Krejcik J. Arthur S. Brennan K. J. Gaffney A. M. Lindenberg K. Luening J. B. Hastings FOCUS Center Departments of Physics and Applied Physics Program University of Michigan Ann Arbor MI 48109 USA Advanced Photon Source Argonne National Laboratory Argonne IL 60439 USA Materials Science Division Argonne National Laboratory Argonne IL 60439 USA National Synchrotron Light Source Brookhaven National Laboratory Upton NY 11973 USA Department of Physics University of California Berkeley CA 94720 USA Consortium for Advanced Radiation Sources The University of Chicago Chicago IL 60637 USA Niels Bohr Institute Copenhagen University 2100 Copenhagen Ø Denmark Deutsches Elektronen-Synchrotron DESY Notkestrasse 85 22607 Hamburg Germany European Synchrotron Radiation Facility 38043 Grenoble Cedex 9 France Institut für Optik und Quantenelektronik Friedrich-Schiller-Universität Jena Max-Wien-Platz 1 07743 Jena Germany Physics Department Lawrence Livermore National Laboratory Livermore CA 94550 USA Department of Physics Lund Institute of Technology P.O. Box 118 S-22100 Lund Sweden Max Plank Institute for Biophysical Chemistry Am Faßberg 11 37077 Göttingen Germany Department of Physics Clarendon Laboratory Parks Road University of Oxford Oxford OX1 3PU United Kingdom Department of Cell and Molecular Biology Biomedical Centre Uppsala University SE-75124 Uppsala Sweden Stanford Linear Accelerator Center Menlo Park CA 94025 USA Stanford Synchrotron Radiation Laboratory/SLAC Menlo Park CA 94025 USA

Linear-accelerator-based sources will revolutionize ultrafast x-ray science due to their unprecedented brightness and short pulse duration. However, time-resolved studies at the resolution of the x-ray pulse duration are hampered by the inability to precisely synchronize an external laser to the accelerator. At the Sub-Picosecond Pulse source at the Stanford Linear-accelerator Center we solved this problem by measuring the arrival time of each high energy electron bunch with electro-optic sampling. This measurement indirectly determined the arrival time of each x-ray pulse relative to an external pump laser pulse with a time resolution of better than 60 fs rms.

关键词： X rays

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Nanoscale visualization and spectral fingerprints of the charge order in ScV6Sn6 distinct from other kagome metals

arXiv

引用

arXiv 2023年

作者： Cheng, Siyu Ren, Zheng Li, Hong Oh, Ji Seop Tan, Hengxin Pokharel, Ganesh DeStefano, Jonathan M. Rosenberg, Elliott Guo, Yucheng Zhang, Yichen Yue, Ziqin Lee, Yongbin Gorovikov, Sergey Zonno, Marta Hashimoto, Makoto Lu, Donghui Ke, Liqin Mazzola, Federico Kono, Junichiro Birgeneau, R.J. Chu, Jiun-Haw Wilson, Stephen D. Wang, Ziqiang Yan, Binghai Yi, Ming Zeljkovic, Ilija Department of Physics Boston College Chestnut HillMA02467 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Physics University of California BerkeleyCA94720 United States Department of Condensed Matter Physics Weizmann Institute of Science Rehovot Israel Materials Department University of California Santa Barbara Santa BarbaraCA93106 United States Department of Physics University of Washington SeattleWA98195 United States Ames Laboratory AmesIA50011 United States Canadian Light Source Inc. 44 Innovation Boulevard SaskatoonSKS7N 2V3 Canada Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States CNR Laboratorio TASC Area Science Park S.S.14 km 163.5 TriesteI-34149 Italy Department of Molecular Sciences and Nanosystems Ca' Foscari University of Venice Venice30172 Italy Materials Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Applied Physics Graduate Program Smalley‐Curl Institute Rice University HoustonTX77005 United States

Charge density waves (CDWs) have been tied to a number of unusual phenomena in kagome metals, including rotation symmetry breaking, time‐reversal symmetry breaking and superconductivity. The majority of the experiments in kagome metals thus far have focused on the CDW states in AV3Sb5 (A=K, Cs, Rb) and FeGe, characterized by the 2a0 by 2a0 CDW period in the kagome plane. Recently, a bulk CDW phase (TCDW ≈ 92 K) with an entirely different wave length and orientation has been reported in ScV6Sn6, as the first realization of a CDW state in the broad RM6X6 crystal structure. Here, using a combination of scanning tunneling microscopy/spectroscopy and angle‐resolved photoemission spectroscopy, we reveal the microscopic structure and the spectroscopic signatures of this charge ordering phase in ScV6Sn6. Differential conductance dI/dV spectra show a partial gap opening in the density‐of‐states of about 20 meV at the Fermi level. This is much smaller than the spectral gaps observed in AV3Sb5 and FeGe despite the comparable TCDW temperatures in these systems, suggesting substantially weaker coupling strength in ScV6Sn6. Surprisingly, despite the three‐dimensional bulk nature of the charge order, we find that the charge modulation is only observed on the kagome termination. Temperature‐dependent band structure evolution suggests a modulation of the surface states as a consequence of the emergent charge order, with an abrupt spectral weight shift below TCDW consistent with the first‐order phase transition. The similarity of the electronic band structures of ScV6Sn6 and TbV6Sn6 (where the charge ordering is absent), together with the first‐principle calculations, suggests that charge ordering in ScV6Sn6 may not be primarily electronically driven. Interestingly, in sharp contrast to the CDW state of cousin AV3Sb5, we find no evidence supporting rotation symmetry breaking. Our results reveal a distinctive nature of the charge ordering phase in ScV6Sn6 in comparison to other kagome

关键词： Charge density waves

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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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Front Cover: Redox Reaction in Ti−Mn Redox Flow Battery Studied by X-ray Absorption Spectroscopy (Chem. Asian J. 1/2023)

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Chemistry – An Asian Journal 2022年第1期18卷

作者： Dr. Daisuke Asakura Dr. Eiji Hosono Dr. Miho Kitamura Dr. Koji Horiba Dr. Eisuke Magome Dr. Hiroyuki Setoyama Dr. Eiichi Kobayashi Dr. Hayato Yuzawa Dr. Takuji Ohigashi Dr. Takaaki Sakai Dr. Ryoichi Kanega Dr. Takashi Funaki Dr. Yukari Sato Dr. Akihiro Ohira Research Institute for Energy Conservation National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan Global Zero Emission Research Center National Institute of Advanced Industrial Science and Technology (AIST) 16-1 Onogawa Tsukuba Ibaraki 305-8569 Japan AIST-University of Tokyo Advanced Operando-Measurement Open Innovation Laboratory 5-1-5 Kashiwanoha Kashiwa Chiba 277-8565 Japan Photon Factory Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) 1-1 Oho Tsukuba Ibaraki 305-0801 Japan SOKENDAI The Graduate University for Advanced Studies 1-1 Oho Tsukuba Ibaraki 305-0801 Japan Institute for Advanced Synchrotron Light Source National Institutes for Quantum Science and Technology (QST) 6-6-11-901 Aoba Aramaki Aoba-ku Sendai Miyagi 980-8579 Japan SAGA Light Source Kyushu Synchrotron Light Research Center 8-7 Yayoigaoka Tosu Saga 841-0005 Japan UVSOR Synchrotron Facility Institute for Molecular Science (IMS) 38 Nishigo-Naka Myodaiji Okazaki Aichi 444-8585 Japan

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Observation of Structural Anisotropy and the Onset of Liquidlike Motion During the Nonthermal Melting of InSb

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Physical Review Letters 2005年第12期95卷 125701-125701页

作者： K. J. Gaffney A. M. Lindenberg J. Larsson K. Sokolowski-Tinten C. Blome O. Synnergren J. Sheppard C. Caleman A. G. MacPhee D. Weinstein D. P. Lowney T. Allison T. Matthews R. W. Falcone A. L. Cavalieri D. M. Fritz S. H. Lee P. H. Bucksbaum D. A. Reis J. Rudati A. T. Macrander P. H. Fuoss C. C. Kao D. P. Siddons R. Pahl K. Moffat J. Als-Nielsen S. Duesterer R. Ischebeck H. Schlarb H. Schulte-Schrepping J. Schneider D. von der Linde O. Hignette F. Sette H. N. Chapman R. W. Lee T. N. Hansen J. S. Wark M. Bergh G. Huldt D. van der Spoel N. Timneanu J. Hajdu R. A. Akre E. Bong P. Krejcik J. Arthur S. Brennan K. Luening J. B. Hastings Stanford Synchrotron Radiation Laboratory/SLAC Menlo Park California 94025 USA Department of Physics Lund Institute of Technology P.O. Box 118 S-22100 Lund Sweden Institut für Optik und Quantenelektronik Friedrich-Schiller Jena Max-Wien-Platz 1 07743 Jena Germany Institut für Experimentelle Physik Universität Duisburg-Essen D-45117 Essen Germany Deutsches Elektronen-Synchrotron DESY Notkestrasse 85 22607 Hamburg Germany Department of Physics Clarendon Laboratory Parks Road University of Oxford Oxford OX1 3PU United Kingdom Department of Cell and Molecular Biology Biomedical Centre Uppsala University SE-75124 Uppsala Sweden Department of Physics University of California Berkeley California 94720 USA FOCUS Center Departments of Physics and Applied Physics Program University of Michigan Ann Arbor Michigan 48109 USA Max-Planck-Institute of Quantum Optics Hans-Kopfermann-Str. 1 D-85748 Garching Germany Advanced Photon Source Argonne National Laboratory Argonne Illinois 60439 USA Materials Science Division Argonne National Laboratory Argonne Illinois 60439 USA National Synchrotron Light Source Brookhaven National Laboratory Upton New York 11973 USA Consortium for Advanced Radiation Sources The University of Chicago Chicago Illinois 60637 USA Niels Bohr Institute Copenhagen University 2100 Copenhagen Ø Denmark European Synchrotron Radiation Facility 38043 Grenoble Cedex 9 France Physics Department Lawrence Livermore National Laboratory Livermore California 94550 USA Stanford Linear Accelerator Center Menlo Park California 94025 USA

The melting dynamics of laser excited InSb have been studied with femtosecond x-ray diffraction. These measurements observe the delayed onset of diffusive atomic motion, signaling the appearance of liquidlike dynamics. They also demonstrate that the root-mean-squared displacement in the [111] direction increases faster than in the [110] direction after the first 500 fs. This structural anisotropy indicates that the initially generated fluid differs significantly from the equilibrium liquid.

关键词： Semiconducting indium compounds

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Two-Step Electronic Response to Magnetic Ordering in a van der Waals Ferromagnet

arXiv

引用

arXiv 2023年

作者： Wu, Han Zhu, Jian-Xin Chen, Lebing Butcher, Matthew W. Yue, Ziqin Yuan, Dongsheng He, Yu Oh, Ji Seop Huang, Jianwei Wu, Shan Gong, Cheng Guo, Yucheng Mo, Sung-Kwan Denlinger, Jonathan D. Lu, Donghui Hashimoto, Makoto Stone, Matthew B. Kolesnikov, Alexander I. Chi, Songxue Kono, Junichiro Nevidomskyy, Andriy H. Birgeneau, Robert J. Dai, Pengcheng Yi, Ming Department of Physics and Astronomy Rice Center for Quantum Materials Rice University HoustonTX77005 United States Theoretical Division Los Alamos National Laboratory Los AlamosNM87545 United States Center for Integrated Nanotechnologies Los Alamos National Laboratory Los AlamosNM87545 United States Department of Physics University of California at Berkeley BerkeleyCA94720 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States 1-1 Namiki Ibaraki Tsukuba305-0044 Japan Department of Applied Physics Yale University New HavenCT06511 United States Department of Electrical and Computer Engineering Quantum Technology Center University of Maryland College ParkMD20742 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States Department of Materials Science and Engineering University of California Berkeley United States

The two-dimensional (2D) material Cr2Ge2Te6 is a member of the class of insulating van der Waals magnets. Here, using high resolution angle-resolved photoemission spectroscopy in a detailed temperature dependence study, we identify a clear response of the electronic structure to a dimensional crossover in the form of two distinct temperature scales marking onsets of modifications in the electronic structure. Specifically, we observe Te p-orbital-dominated bands to undergo changes at the Curie transition temperature TC while the Cr d-orbital-dominated bands begin evolving at a higher temperature scale. Combined with neutron scattering, density functional theory calculations, and Monte Carlo simulations, we find that the electronic system can be consistently understood to respond sequentially to the distinct temperatures at which in-plane and out-of-plane spin correlations exceed a characteristic length scale. Our findings reveal the sensitivity of the orbital-selective electronic structure for probing the dynamical evolution of local moment correlations in vdW insulating magnets. © 2023, CC BY.

关键词： Electronic structure

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