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Filling of the Mott-Hubbard Gap in the High Temperature Photoemission Spectrum of (V0.972Cr0.028)2O3

Physical Review Letters 2004年第7期93卷 076404-076404页

作者： S.-K. Mo H.-D. Kim J. W. Allen G.-H. Gweon J. D. Denlinger J.-H. Park A. Sekiyama A. Yamasaki S. Suga P. Metcalf K. Held Randall Laboratory of Physics University of Michigan Ann Arbor Michigan 48109 USA Pohang Accelerator Laboratory Pohang 790-784 Korea Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics Pohang University of Science and Technology Pohang 790-784 Korea Department of Material Physics Graduate School of Engineering Science Osaka University 1-3 Machikaneyama Toyonaka Osaka 560-8531 Japan Department of Physics Purdue University West Lafayette Indiana 47907 USA Max Planck Institute for Solid State Research Heisenbergstrasse 1 D-70569 Stuttgart Germany

Photoemission spectra of the paramagnetic insulating phase of (V0.972Cr0.028)2O3, taken in ultrahigh vacuum up to the unusually high temperature (T) of 800 K, reveal a property unique to the Mott-Hubbard (MH) insulator that has not been observed previously. With increasing T the MH gap is filled by spectral weight transfer, in qualitative agreement with high-T theoretical calculations combining dynamical mean field theory and band theory in the local density approximation.

关键词： Photoemission

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Fabrication of Dealloyed Pt2os Nanoparticles for Oxygen Reduction Reaction in Acidic Electrolytes

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ECS Meeting Abstracts 2013年第3期MA2013-02卷

作者： Yi-Juei Lee Yu-Chi Hsieh Yu Sun Li-Chung Chang Pu-Wei Wu Jyh-Fu Lee Department of Materials Science and Engineering National Chiao Tung University Department of Materials Science and Engineering National Chiao Tung University 1001 Ta Hsueh Road Hsinchu City Taiwan 300 Graduate Program for Science and Technology of Accelerator Light Source National Chiao Tung University Graduate Program for Science and Technology of Accelerator Light Source National Chiao Tung University 1001 Ta Hsueh Road Hsinchu City Taiwan 300 National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu Science Park Hsin-Chu 30076 Taiwan ROC

Abstract not Available.

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Serial-femtosecond crystallography reveals how a phytochrome variant couples chromophore and protein structural changes

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science Advances 2025年第22期11卷

作者： Luisa Sauthof Michal Szczepek Andrea Schmidt Asmit Bhowmick Medhanjali Dasgupta Megan J. Mackintosh Sheraz Gul Franklin D. Fuller Ruchira Chatterjee Iris D. Young Norbert Michael Nicolas Andreas Heyder Brian Bauer Anja Koch Isabel Bogacz In-Sik Kim Philipp S. Simon Agata Butryn Pierre Aller Volha U. Chukhutsina James M. Baxter Christopher D. M. Hutchison Dorothee Liebschner Billy Poon Nicholas K. Sauter Mitchell D. Miller George N. Roberto Alonso-Mori Mark S. Hunter Alexander Batyuk Shigeki Owada Kensuke Tono Rie Tanaka Jasper J. van Thor Norbert Krauß Tilman Lamparter Aaron S. Brewster Igor Schapiro Allen M. Orville Vittal K. Yachandra Junko Yano Peter Hildebrandt Jan F. Kern Patrick Scheerer Charité–Universitätsmedizin Berlin corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin Institute of Medical Physics and Biophysics Group Structural Biology of Cellular Signaling Charitéplatz 1 D-10117 Berlin Germany. Molecular Biophysics and Integrated Bioimaging Division Lawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley CA 94720 USA. Fritz Haber Center for Molecular Dynamics Research Institute of Chemistry The Hebrew University of Jerusalem Jerusalem 9190401 Israel. Linac Coherent Light Source (LCLS) SLAC National Accelerator Laboratory 2575 Sand Hill Road MS103 Menlo Park CA 94025 USA. Technische Universität Berlin Institut für Chemie Sekr. PC 14 Straße des 17. Juni 135 Berlin D-10623 Germany. Diamond Light Source Ltd. Harwell Science and Innovation Campus Didcot Oxfordshire OX11 0DE UK. Research Complex at Harwell Harwell Science and Innovation Campus Didcot Oxfordshire OX11 0FA UK. Imperial College London Life Sciences Department South Kensington Campus London SW7 2AZ UK. Rice University Department of Biosciences 6100 Main Street Houston TX 77005 USA. Japan Synchrotron Radiation Research Institute Kouto 1-1-1 Sayo Hyogo 679-5198 Japan. RIKEN SPring-8 Center 1-1-1 Kouto Sayo Hyogo 679-5148 Japan. Department of Cell Biology Graduate School of Medicine Kyoto University Yoshidakonoecho Sakyo-ku Kyoto 606-8501 Japan. Karlsruhe Institute of Technology (KIT) Joseph Gottlieb Kölreuter Institute of Plant Science (JKIP) Fritz Haber Weg 4 D-76131 Karlsruhe Germany. Department of Physics Technical University Dortmund Dortmund Germany. Research Center Chemical Sciences and Sustainability University Alliance Ruhr 44801 Bochum Germany.

The photoreaction and commensurate structural changes of a chromophore within biological photoreceptors elicit conformational transitions of the protein promoting the switch between deactivated and activated states. We investigated how this coupling is achieved in a bacterial phytochrome variant, Agp2-PAiRFP2. Contrary to classical protein crystallography, which only allows probing (cryo-trapped) stable states, we have used time-resolved serial femtosecond x-ray crystallography (tr-SFX) and pump-probe techniques with various illumination and delay times with respect to photoexcitation of the parent Pfr state. Thus, structural data for seven time frames were sorted into groups of molecular events along the reaction coordinate. They range from chromophore isomerization to the formation of Meta-F, the intermediate that precedes the functional relevant secondary structure transition of the tongue. Structural data for the early events were used to calculate the photoisomerization pathway to complement the experimental data. Late events allow identifying the molecular switch that is linked to the intramolecular proton transfer as a prerequisite for the following structural transitions.

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Expression, purification, crystallization, and preliminary X-ray crystallographic studies of the human adiponectin receptors, AdipoR1 and AdipoR2

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Journal of Structural and Functional Genomics 2015年第1期16卷 11-23页

作者： Tanabe, Hiroaki Motoyama, Kanna Ikeda, Mariko Wakiyama, Motoaki Terada, Takaho Ohsawa, Noboru Hosaka, Toshiaki Hato, Masakatsu Fujii, Yoshifumi Nakamura, Yoshihiro Ogasawara, Satoshi Hino, Tomoya Murata, Takeshi Iwata, So Okada-Iwabu, Miki Iwabu, Masato Hirata, Kunio Kawano, Yoshiaki Yamamoto, Masaki Kimura-Someya, Tomomi Shirouzu, Mikako Yamauchi, Toshimasa Kadowaki, Takashi Yokoyama, Shigeyuki RIKEN Systems and Structural Biology Center 1-7-22 Suehiro-cho Tsurumi-ku Yokohama 230-0045 Japan Department of Biophysics and Biochemistry and Laboratory of Structural Biology Graduate School of Science The University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan Division of Structural and Synthetic Biology RIKEN Center for Life Science Technologies 1-7-22 Suehiro-cho Tsurumi-ku Yokohama 230-0045 Japan RIKEN Structural Biology Laboratory 1-7-22 Suehiro-cho Tsurumi-ku Yokohama 230-0045 Japan Department of Cell Biology Graduate School of Medicine Kyoto University Yoshida-Konoe-cho Sakyo-ku Kyoto 606-8501 Japan JST Research Acceleration Program Membrane Protein Crystallography Project Yoshida-Konoe-cho Sakyo-ku Kyoto 606-8501 Japan Department of Chemistry Graduate School of Science Chiba University Yayoi-cho Inage Chiba 263-8522 Japan Division of Molecular Biosciences Membrane Protein Crystallography Group Imperial College London SW7 2AZ United Kingdom Diamond Light Source Harwell Science and Innovation Campus Chilton Didcot Oxfordshire OX11 0DE United Kingdom RIKEN SPring-8 Center Harima Institute Kouto Sayo 679-5148 Hyogo Japan Department of Diabetes and Metabolic Diseases Graduate School of Medicine The University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan Department of Integrated Molecular Science on Metabolic Diseases 22nd Century Medical and Research Center The University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan CREST Japan Science and Technology Agency Kawaguchi 332-0012 Saitama Japan

The adiponectin receptors (AdipoR1 and AdipoR2) are membrane proteins with seven transmembrane helices. These receptors regulate glucose and fatty acid metabolism, thereby ameliorating type 2 diabetes. The full-length human AdipoR1 and a series of N-terminally truncated mutants of human AdipoR1 and AdipoR2 were expressed in insect cells. In small-scale size exclusion chromatography, the truncated mutants AdipoR1Δ88 (residues 89–375) and AdipoR2Δ99 (residues 100–386) eluted mostly in the intact monodisperse state, while the others eluted primarily as aggregates. However, gel filtration chromatography of the large-scale preparation of the tag-affinity-purified AdipoR1Δ88 revealed the presence of an excessive amount of the aggregated state over the intact state. Since aggregation due to contaminating nucleic acids may have occurred during the sample concentration step, anion-exchange column chromatography was performed immediately after affinity chromatography, to separate the intact AdipoR1Δ88 from the aggregating species. The separated intact AdipoR1Δ88 did not undergo further aggregation, and was successfully purified to homogeneity by gel filtration chromatography. The purified AdipoR1Δ88 and AdipoR2Δ99 proteins were characterized by thermostability assays with 7-diethylamino-3-(4-maleimidophenyl)-4-methyl coumarin, thin layer chromatography of bound lipids, and surface plasmon resonance analysis of ligand binding, demonstrating their structural integrities. The AdipoR1Δ88 and AdipoR2Δ99 proteins were crystallized with the anti-AdipoR1 monoclonal antibody Fv fragment, by the lipidic mesophase method. X-ray diffraction data sets were obtained at resolutions of 2.8 and 2.4 Å, respectively. © 2015, The Author(s).

关键词： Adiponectin receptors AdipoR1 and AdipoR2 Antibody Crystallization Lipidic mesophase Membrane protein Purification

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Orbital-dependent spin textures in Bi2Se3 quantum well states

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Physical Review B 2018年第7期98卷 075149-075149页

作者： Chiu-Yun Lin Kenneth Gotlieb Chris Jozwiak Jonathan A. Sobota Zhi-Xun Shen James G. Analytis Zahid Hussain Alessandra Lanzara Department of Physics University of California Berkeley California 94720 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Graduate Group in Applied Science & Technology University of California Berkeley California 94720 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA 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

Understanding the fine interplay between spin and orbital degrees of freedom in the surface states of topological insulators is the key to the development of next-generation spintronics devices. So far, the majority of studies have focused on the helical spin texture of the topologically protected surface state (TSS) and little attention has been devoted to the spin texture of the other surface states: the bulk-originated quantum well states (QWSs). This paper presents such study in a prototypical topological insulator, Bi2Se3. By using spin- and angle-resolved photoemission spectroscopy, we reveal a full momentum-dependent spin texture of the QWSs and their response to light polarization. We find that these states share a similar spin-orbital texture with the TSS. This paper shows an intimate correlation between the surface and bulk states, which was overseen before, and provides relevant information to understand how the surface states evolve with the bulk states.

关键词： Rashba coupling Spin-orbit coupling Surface states Topological materials Quantum wells Angle-resolved photoemission spectroscopy Spin-resolved photoemission spectroscopy

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Electronic transitions in CePd2Si2 studied by resonant x-ray emission spectroscopy at high pressures and low temperatures

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Physical Review B 2012年第23期86卷 235131-235131页

作者： Hitoshi Yamaoka Yumiko Zekko Akio Kotani Ignace Jarrige Naohito Tsujii Jung-Fu Lin Jun'ichiro Mizuki Hideki Abe Hideaki Kitazawa Nozomu Hiraoka Hirofumi Ishii Ku-Ding Tsuei Harima Institute RIKEN (The Institute of Physical and Chemical Research) Sayo Hyogo 679-5148 Japan Graduate School of Science and Technology Kwansei Gakuin University Sanda Hyogo 669-1337 Japan Photon Factory Institute of Materials Structure Science High Energy Accelerator Research Organization 1-1 Oho Tsukuba Ibaraki 305-0801 Japan National Synchrotron Light Source II Brookhaven National Laboratory Upton New York 11973 USA Quantum Beam Center National Institute for Materials Science 1-2-1 Sengen Tsukuba 305-0047 Japan Department of Geological Sciences The University of Texas at Austin Austin Texas 78712 USA National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan

Temperature and pressure dependences of the electronic structure of the heavy-fermion system CePd2Si2 have been investigated using partial fluorescence yield x-ray absorption spectroscopy and resonant x-ray emission spectroscopy at the Ce L3 edge. The temperature dependence has also been measured for CeRh2Si2 for comparison. In both compounds Ce is in a weakly mixed valence state at ambient pressure, mostly f1 with a small contribution from the f0 component. No temperature dependence of the Ce valence is observed at temperatures as low as 8 K. In CePd2Si2 at 19 K, however, the Ce valence shows a continuous increase with pressure, indicating pressure-induced delocalization of the 4f states. Theoretical calculations based on the single impurity Anderson model reproduce the experimental results well. Pressure dependence of the difference between the ground state valence and the measured valence including the final state effect is also discussed.

关键词： ELECTRONIC structure ABSORPTION spectra X-ray spectroscopy CESIUM compounds CONDUCTION electrons PHYSICS

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

arXiv

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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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Spontaneous spin chirality reversal and competing phases in the topological magnet EuAl4

arXiv

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arXiv 2024年

作者： Vibhakar, A.M. Khalyavin, D.D. Orlandi, F. Moya, J.M. Lei, S. Morosan, E. Bombardi, A. Diamond Light Source Ltd Harwell Science and Innovation Campus Didcot OxfordshireOX11 0DE United Kingdom ISIS facility Rutherford Appleton Laboratory-STFC Chilton DidcotOX11 0QX United Kingdom Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Hong Kong University of Science and Technology Clear Water Bay Hong Kong

We demonstrate the spontaneous reversal of spin chirality in a single crystal sample of the inter-metallic magnet EuAl4. We solve the nanoscopic nature of each of the four magnetically phases of EuAl4 using resonant magnetic x-ray scattering, and demonstrate all four phases order with single-k incommensurate magnetic modulation vectors. Below 15.4 K the system forms a spin density modulated spin structure where the spins are orientated in the ab plane perpendicular to the orientation of the magnetic propagation vector. Below 13.2 K a second spin density wave orders with moments aligned parallel to the c-axis, such that the two spin density wave orders coexist. Below 12.2 K a magnetic helix of a single chirality is stabilised across the entire sample. Below 10 K the chirality of the magnetic helix reverses, and the sample remains a single chiral domain. Concomitant with the establishment of the helical magnetic ordering is the lowering of the crystal symmetry to monoclinic, as evidenced the formation of uniaxial charge and spin strip domains. A group theoretical analysis demonstrates that below 12.2 K the symmetry lowers to polar monoclinic, which is necessary to explain the observed asymmetry in the chiral states of the magnetic helix and the spin chiral reversal. We find that in every magnetically ordered phase of EuAl4 the in-plane moment is perpendicular to the orientation of the magnetic propagation vector, which we demonstrate is favoured by magnetic dipolar interactions. Copyright © 2024, The Authors. All rights reserved.

关键词： Aluminum alloys

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Photoemission study of (V1−xMx)2O3 (M=Cr,Ti)

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Physical Review B 2006年第16期74卷 165101-165101页

作者： S.-K. Mo H.-D. Kim J. D. Denlinger J. W. Allen J.-H. Park A. Sekiyama A. Yamasaki S. Suga Y. Saitoh T. Muro P. Metcalf Randall Laboratory of Physics University of Michigan Ann Arbor Michigan 48109 USA Pohang Accelerator Laboratory Pohang 790-784 Korea Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics Pohang University of Science and Technology Pohang 790-784 Korea Department of Material Physics Graduate School of Engineering Science Osaka University 1-3 Machikaneyama Toyonaka Osaka 560-8531 Japan Department of Synchrotron Radiation Research Japan Atomic Energy Research Institute SPring-8 Sayo Hyogo 679-5143 Japan Japan Synchrotron Radiation Research Institute SPring-8 Sayo Hyogo 679-5143 Japan Department of Physics Purdue University West Lafayette Indiana 47907 USA

We present high-resolution bulk-sensitive photoemission spectra of (V1−xMx)2O3 (M=Cr,Ti). The measurements were made for the paramagnetic metal (PM), paramagnetic insulator (PI), and antiferromagnetic insulator (AFI) phases of (V1−xMx)2O3 with the samples of x=0, 0.012, and 0.028 for Cr doping and x=0.01 for Ti doping. In the PM phase, we observe a prominent quasiparticle peak in general agreement with theory, which combines dynamical mean-field theory with the local density approximation (LDA+DMFT). The quasiparticle peak shows a significantly larger peak width and weight than in the theory. For both the PI and AFI phases, the vanadium 3d parts of the valence spectra are not simple one peak structures. For the PI phase, there is not yet a good theoretical understanding of these structures. The size of the electron removal gap increases, and spectral weight accumulates in the energy range closer to the chemical potential, when the PI to AFI transition occurs. Spectra taken in the same phases with different compositions show interesting monotonic changes as the dopant concentration increases, regardless of the dopant species. With increased Cr-doping, the AFI phase gap decreases and the PI phase gap increases.

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Time-resolved optical response of all-oxide YBa2Cu3O7/La0.7Sr0.3MnO3 proximitized bilayers

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Physical Review B 2013年第13期87卷 134514-134514页

作者： L. Parlato R. Arpaia C. De Lisio F. Miletto Granozio G. P. Pepe P. Perna V. Pagliarulo C. Bonavolontà M. Radovic Y. Wang Roman Sobolewski U. Scotti di Uccio CNR-SPIN and Dipartimento di Scienze Fisiche Complesso Universitario di Monte Sant'Angelo Via Cinthia I-80125 Napoli Italy IMDEA-Nanociencia Campus Universidad Autonóma de Madrid 28049 Madrid Spain Swiss Light Source Paul Scherrer Institute CH-5232 Villigen PSI Switzerland and Laboratory for Synchrotron and Neutron Spectroscopy EPFL Lausanne Switzerland Materials Science Graduate Program and Laboratory for Laser Energetics University of Rochester Rochester New York 14627-0231 USA Institute of Electron Technology PL-02668 Warszawa Poland and the University of Rochester Rochester New York 14627-0231 USA

We present femtosecond pump–probe spectroscopy studies of time-resolved optical reflectivity of all-oxide YBa2Cu3O7/La0.7Sr0.3MnO3 (YBCO/LSMO) superconductor/ferromagnet (S/F) bilayers consisting of a 100-nm-thick YBCO base layer and either 10 or 35 nm LSMO cap thickness. At temperatures far below the YBCO superconducting transition TC, samples with a 10 nm F overlayer show a photoresponse that is similar to, but faster than, pure-YBCO, 100-nm-thick reference samples, while close to TC and above (up to ∼160 K) we observe a signature of both the electronic and spin response that cannot be interpreted as an incoherent sum of contributions from the two layers. The photoresponse of the S/F structures with the 35-nm LSMO layer always qualitatively follows that of the pure LSMO, but with a shorter relaxation time. In all cases, the YBCO/LSMO nonequilibrium dynamics can be modeled using a generalized multitemperature model, which is a superposition of the dynamics of the three-temperature models that are used to describe the superconductor and ferromagnet subsystems, respectively. The long term of the photoresponse signal of the S/F bilayer can be well fitted with the two characteristic relaxation times.

关键词： SUPERCONDUCTORS FERROMAGNETIC materials FERROMAGNETISM FERROMAGNETIC resonance CONDENSED matter

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