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arXiv 2022年

作者： Chen, Hongwei Chitturi, Sathya R. Plumley, Rajan Shen, Lingjia Drucker, Nathan C. Burdet, Nicolas Peng, Cheng Mardanya, Sougata Ratner, Daniel Mishra, Aashwin Yoon, Chun Hong Song, Sanghoon Chollet, Matthieu Fabbris, Gilberto Dunne, Mike Nelson, Silke Li, Mingda Lindenberg, Aaron Jia, Chunjing Nashed, Youssef Bansil, Arun Chowdhury, Sugata Feiguin, Adrian E. Turner, Joshua J. Thayer, Jana B. Linac Coherent Light Source Slac National Accelerator Laboratory Menlo Park United States Stanford Institute for Materials and Energy Sciences Stanford University Stanford United States Department of Materials Science and Engineering Stanford University Stanford United States Department of Physics Northeastern University Boston United States Department of Physics Carnegie Mellon University Pittsburgh United States School of Engineering and Applied Sciences Harvard University Cambridge United States Department of Physics and Astrophysics Howard University Washington United States Advanced Photon Source Argonne National Laboratory Argonne United States Department of Nuclear Science & Engineering The Massachusetts Institute of Technology Cambridge United States

The advent of next-generation X-ray free electron lasers will be capable of delivering X-rays at a repetition rate approaching 1 MHz continuously. This will require the development of data systems to handle experiments at these type of facilities, especially for high throughput applications, such as femtosecond X-ray crystallography and X-ray photon fluctuation spectroscopy. Here, we demonstrate a framework which captures single shot X-ray data at the LCLS and implements a machine-learning algorithm to automatically extract the contrast parameter from the collected data. We measure the time required to return the results and assess the feasibility of using this framework at high data volume. We use this experiment to determine the feasibility of solutions for 'live' data analysis at the MHz repetition rate. © 2022, CC BY.

关键词： Machine learning

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Observation of Kondo lattice and Kondo-enhanced anomalous Hall effect in an itinerant ferromagnet

arXiv

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arXiv 2023年

作者： Cheng, Zi-Jia Huang, Yuqing Zheng, Pengyu Chen, Lei Cochran, Tyler A. Hu, Haoyu Yin, Jia-Xin Yang, Xian P. Hossain, Md Shafayat Zhang, Qi Belopolski, Ilya Liu, Rui Cheng, Guangming Hashimoto, Makoto Lu, Donghui Xu, Xitong Zhou, Huibin Ma, Wenlong Chang, Guoqing Yao, Nan Yin, Zhiping Zahid Hasan, M. Jia, Shuang Department of Physics Princeton University PrincetonNJ United States International Center for Quantum Materials School of Physics Peking University Beijing China Department of Physics Center for Advanced Quantum Studies Beijing Normal University Beijing China Department of Physics and Astronomy Rice University HoustonTX United States Princeton Materials Institute Princeton University PrincetonNJ United States Stanford Synchrotron Radiation Light Source SLAC National Accelerator Laboratory Menlo ParkCA United States Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore Princeton Institute for Science and Technology of Materials Princeton University PrincetonNJ United States Interdisciplinary Institute of Light-Element Quantum Materials Research Center for Light-Element Advanced Materials Peking University Beijing100871 China

The interplay between Kondo screening and magnetic interactions is central to comprehending the intricate phases in heavy-fermion compounds. However, the role of the itinerant magnetic order, which is driven by the conducting (c) electrons, has been largely uncharted in the context of heavy-fermion systems due to the scarcity of material candidates. Here we demonstrate the coexistence of the coherent Kondo screening and d-orbital ferromagnetism in material system La1−xCexCo2As2, through comprehensive thermodynamic and electrical transport measurements. Additionally, using angle-resolved photoemission spectroscopy (ARPES), we further observe the f-orbit-dominated bands near the Fermi level (Ef) and signatures of the f-c hybridization below the magnetic transition temperature, providing strong evidence of Kondo lattice state in the presence of ferromagnetic order. Remarkably, by changing the ratio of Ce/La, we observe a substantial enhancement of the anomalous Hall effect (AHE) in the Kondo lattice regime. The value of the Hall conductivity quantitatively matches with the first-principle calculation that optimized with our ARPES results and can be attributed to the large Berry curvature (BC) density engendered by the topological nodal rings composed of the Ce-4f and Co-3d orbitals at Ef. Our findings point to the realization of a new platform for exploring correlation-driven topological responses in a novel Kondo lattice environment. © 2023, CC BY-NC-SA.

关键词： Ferromagnetism

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Attosecond inner-shell lasing at Ångstrӧm wavelengths

arXiv

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arXiv 2024年

作者： Linker, Thomas M. Halavanau, Aliaksei Kroll, Thomas Benediktovitch, Andrei Zhang, Yu Michine, Yurina Chuchurka, Stasis Abhari, Zain Ronchetti, Daniele Fransson, Thomas Weninger, Clemens Fuller, Franklin D. Aquila, Andy Alonso-Mori, Roberto Boutet, Sébastien Guetg, Marc W. Marinelli, Agostino Lutman, Alberto A. Yabashi, Makina Inoue, Ichiro Osaka, Taito Yamada, Jumpei Inubushi, Yuichi Yamaguchi, Gota Hara, Toru Babu, Ganguli Salpekar, Devashish Sayed, Farheen N. Ajayan, Pulickel M. Kern, Jan Yano, Junko Yachandra, Vittal K. Kling, Matthias F. Pellegrini, Claudio Yoneda, Hitoki Rohringer, Nina Bergmann, Uwe Stanford PULSE Institute SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Department of Physics University of Wisconsin-Madison MadisonWI53706 United States Accelerator Research Division SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Center for Free-Electron Laser Science CFEL Deutsches Elektronen-Synchrotron DESY Notkestr. 85 Hamburg22607 Germany Institute for Laser Science The University of Electro-Communications Chofu Tokyo182-8585 Japan Department of Physics Universität Hamburg Hamburg22761 Germany Max Planck School of Photonics Friedrich-Schiller University of Jena Jena07745 Germany Department of Theoretical Chemistry and Biology KTH Royal Institute of Technology Stockholm Sweden Linac Coherent Light Source SLAC National Accelerator Laboratory Menlo ParkCA94025 United States MAX IV Laboratory Lund University Lund224 84 Sweden RIKEN SPring-8 Center Sayo-gun Sayo-cho Hyogo 679-5148 Japan Japan Synchrotron Radiation Research Institute Sayo-gun Sayo-cho Hyogo 679-5198 Japan Department of Materials Science and Nano Engineering Rice University HoustonTX7700512 United States Molecular Biophysics and Integrated Bioimaging Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Applied Physics Stanford University StanfordCA94305 United States

Since the invention of the laser, nonlinear effects such as filamentation1, Rabi cycling2,3 and collective emission4 have been explored in the optical regime leading to a wide range of scientific and industrial applications5–8. X-ray free electron lasers (XFELs) have led to the extension of many optical techniques to X-rays for their advantages of Ångstrӧm scale spatial resolution and elemental specificity9. One such example is XFEL-driven population inversion of 1s core hole states resulting in inner-shell Kα1 (2p3/2 → 1s1/2) X-ray lasing in elements ranging from neon to copper, which has been utilized for nonlinear spectroscopy and development of next generation X-ray laser sources10–16. Here we show that strong lasing effects, similar to those observed in the optical regime, can occur at 1.5 – 2.1 Å wavelengths during high intensity (>1019 W/cm2) XFEL-driven inner-shell lasing and superfluorescence of copper and manganese. Depending on the temporal substructure of the XFEL pump pulses, the resulting inner-shell X-ray laser pulses (containing ~106-108 photons) can exhibit strong spatial inhomogeneities as well as spectral splitting, inhomogeneities, and broadening. Through 3D Maxwell Bloch theory17 we show that the observed spatial inhomogeneities result from X-ray filamentation, and that the spectral splitting and broadening is driven by Rabi cycling with sub-femtosecond periods. Our simulations indicate that these X-ray pulses can have pulse lengths of less than 100 attoseconds and coherence properties that open the door for quantum X-ray optics applications. © 2024, CC BY.

关键词： X ray lasers

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Realizing Attosecond Core-Level X-ray Spectroscopy for the Investigation of Condensed Matter Systems

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Ultrafast science 2023年第4期3卷 1-13页

作者： Adam M.Summers Stefano Severino Maurizio Reduzzi Themistoklis P.H.Sidiropoulos Daniel E.Rivas Nicola Di Palo Hung-Wei Sun Ying-Hao Chien Iker Leon Barbara Buades Seth L.Cousin Stephan M.Teichmann Tobias Mey Klaus Mann Barbara Keitel Elke Plonjes Dmitri K.Efetov Heinrich Schwoerere Jens Biegert ICFO-Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology08860 CastelldefelsBarcelonaSpain Linac Coherent Light Source SLAC National Accelerator LaboratoryMenlo ParkCA 94025USA European XFEL Holzkoppel 422869 SchenefeldGermany Institut für Nanophotonik Göttingen e.V. Hans-Adolf-Krebs-Weg 137077 GöttingenGermany Deutsches Elektronen-Synchrotron Notkestraße 8522607 HamburgGermany Max-Planck-Institut für Struktur und Dynamik der Materie 22761 HamburgGermany ICREA Pg.Lluís Companys 2308010 BarcelonaSpain

Unraveling the exact nature of nonequilibrium and correlated interactions is paramount for continued progress in many areas of condensed matter science. Such insight is a prerequisite to develop an engineered approach for smart materials with targeted properties designed to address standing needs such as efficient light harvesting, energy storage, or information processing. For this goal, it is critical to unravel the dynamics of the energy conversion processes between carriers in the earliest time scales of the excitation dynamics. We discuss the implementation and benefits of attosecond soft x-ray core-level spectroscopy up to photon energies of 600 eV for measurements in solid-state systems. In particular, we examine how the pairing between coherent spectral coverage and temporal resolution provides a powerful new insight into the quantum dynamic interactions that determine the macroscopic electronic and optical response. We highlight the different building blocks of the methodology and point out the important aspects for its application from condensed matter studies to materials as thin as 25 nm. Furthermore, we discuss the technological developments in the field of tabletop attosecond soft x-ray sources with time-resolved measurements at the near and extended edge simultaneously and investigate the exciting prospective of extending such technique to the study of 2-dimensional materials.

关键词： Attosecond science Core-level x-ray Spectroscopy High Harmonic Generation X-ray Absorption Ultrafast solid-state dynamics

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Ubiquitous Flat Bands in a Cr-based Kagome Superconductor

arXiv

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arXiv 2024年

作者： Guo, Yucheng Wang, Zehao Xie, Fang Huang, Yuefei Gao, Bin Oh, Ji Seop Wu, Han Liu, Zhaoyu Ren, Zheng Fang, Yuan Biswas, Ananya Zhang, Yichen Yue, Ziqin Hu, Cheng Jozwiak, Chris Bostwick, Aaron Rotenberg, Eli Hashimoto, Makoto Lu, Donghui Kono, Junichiro Chu, Jiun-Haw Yakobson, Boris I. Birgeneau, Robert J. Si, Qimiao Dai, Pengcheng Yi, Ming Department of Physics and Astronomy Rice University HoustonTX77005 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Department of Physics University of California BerkeleyCA94720 United States Department of Physics University of Washington Washington98105 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States

In the quest for novel quantum states driven by topology and correlation, kagome lattice materials have garnered significant interest due to their distinctive electronic band structures, featuring flat bands (FBs) arising from the quantum destructive interference of the electronic wave function. The tuning of the FBs to the chemical potential would lead to the possibility of liberating electronic instabilities that lead to emergent electronic orders. Despite extensive studies, direct evidence of FBs tuned to the chemical potential and their participation in emergent electronic orders have been lacking in bulk quantum materials. Here using a combination of Angle-Resolved Photoemission Spectroscopy (ARPES) and Density Functional Theory (DFT), we reveal that the low-energy electronic structure of the recently discovered Cr-based kagome metal superconductor CsCr3Sb5 is dominated by a pervasive FB in close proximity to, and below the Fermi level. A comparative analysis with orbital-projected DFT and polarization dependence measurement uncovers that an orbital-selective renormalization mechanism is needed to reconcile the discrepancy with the DFT calculations, which predict the FB to appear 200 meV above the Fermi level. Furthermore, we observe the FB to shift away from the Fermi level by 20 meV in the low-temperature density wave-ordered phase, highlighting the role of the FB in the emergent electronic order. Our results reveal CsCr3Sb5 to stand out as a promising platform for further exploration into the effects of FBs near the Fermi level on kagome lattices, and their role in emergent orders in bulk quantum materials. © 2024, CC BY.

关键词： Density functional theory

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Kramers nodal lines in intercalated TaS2 superconductors

arXiv

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arXiv 2025年

作者： Zhang, Yichen Gao, Yuxiang Pulkkinen, Aki Guo, Xingyao Huang, Jianwei Guo, Yucheng Yue, Ziqin Oh, Ji Seop Moon, Alex Oudah, Mohamed Gao, Xue-Jian Fedorov, Alexei Mo, Sung-Kwan Hashimoto, Makoto Lu, Donghui Rajapitamahuni, Anil Vescovo, Elio Kono, Junichiro Hallas, Alannah M. Birgeneau, Robert J. Balicas, Luis Minár, Ján Hosur, Pavan Law, Kam Tuen Morosan, Emilia Yi, Ming Rice University HoustonTX77005 United States New Technologies Research Center University of West Bohemia Plzen301 00 Czech Republic Department of Physics Hong Kong University of Science and Technology Clear Water Bay Hong Kong Department of Physics University of California BerkeleyCA94720 United States National High Magnetic Field Laboratory TallahasseeFL32310 United States Stewart Blusson Quantum Matter Institute University of British Columbia VancouverBCV6T 1Z4 Canada 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 National Synchrotron Light Source II Brookhaven National Lab UptonNY11973 United States Department of Physics & Astronomy University of British Columbia VancouverBCV6T 1Z1 Canada Canadian Institute for Advanced Research TorontoONM5G 1M1 Canada Materials Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics Texas Center for Superconductivity University of Houston HoustonTX77204 United States

Kramers degeneracy is one fundamental embodiment of the quantum mechanical nature of particles with half-integer spin under time reversal symmetry. Under the chiral and noncentrosymmetric achiral crystalline symmetries, Kramers degeneracy emerges respectively as topological quasiparticles of Weyl fermions and Kramers nodal lines, anchoring the Berry phase-related physics of electrons. However, an experimental demonstration for ideal Kramers nodal lines (KNLs) well isolated at the Fermi level is lacking. Here, we establish a class of noncentrosymmetric achiral intercalated transition metal dichalcogenide (TMD) superconductors with large Ising-type spin-orbit coupling, represented by InxTaS2, to host an ideal KNL phase. We provide evidence from angle-resolved photoemission spectroscopy (ARPES) with spin resolution, angle-dependent quantum oscillation (QO) measurements, and ab-initio calculations. Our work not only provides a realistic platform for realizing and tuning KNLs in layered materials, but also paves the way for exploring the interplay between KNLs and superconductivity, as well as applications pertaining to spintronics, valleytronics, and nonlinear transport. © 2025, CC BY-NC-ND.

关键词： Photoelectron spectroscopy

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Observation of polarization density waves in SrTiO3

arXiv

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arXiv 2024年

作者： Orenstein, Gal Krapivin, Viktor Huang, Yijing Zhang, Zhuquan de la Peña Muñoz, Gilberto Duncan, Ryan A. Nguyen, Quynh Stanton, Jade Teitelbaum, Samuel Yavas, Hasan Sato, Takahiro Hoffmann, Matthias C. Kramer, Patrick Zhang, Jiahao Cavalleri, Andrea Comin, Riccardo Dean, Mark P.M. Disa, Ankit S. Först, Michael Johnson, Steven L. Mitrano, Matteo Rappe, Andrew M. Reis, David Zhu, Diling Nelson, Keith A. Trigo, Mariano Stanford PULSE Institute SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Department of Applied Physics Stanford University StanfordCA94305 United States Department of Physics University of Illinois at Urbana-Champaign UrbanaIL61820 United States Department of Chemistry Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics Arizona State University TempeAZ85281 United States Linac Coherent Light Source SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Department of Materials Science and Engineering University of Pennsylvania Philadelphia19104 United States Max Planck Institute for the Structure and Dynamics of Matter Hamburg Germany Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory UptonNY11973 United States School of Applied & Engineering Physics Cornell University IthacaNY14853 United States Institute for Quantum Electronics Physics Department ETH Zurich ZurichCH-8093 Switzerland SwissFEL Paul Scherrer Institut Villigen PSICH-5232 Switzerland Department of Physics Harvard University CambridgeMA02138 United States

The nature of the "failed" ferroelectric transition in SrTiO3 has been a long-standing puzzle in condensed matter physics [1, 2, 3, 4]. A compelling explanation is the competition between ferroelectricity and an instability with a mesoscopic modulation of the polarization[5, 6, 7, 8]. These polarization density waves, which should become especially strong near the quantum critical point[2, 6], break local inversion symmetry and are difficult to probe with conventional x-ray scattering methods. Here we combine a femtosecond x-ray free electron laser (XFEL) with THz coherent control methods to probe inversion symmetry breaking at finite momenta[9] and visualize the instability of the polarization on nanometer lengthscales in SrTiO3. We find polar-acoustic collective modes that are soft particularly at the tens of nanometer lengthscale. These precursor collective excitations provide evidence for the conjectured mesoscopic modulated phase in SrTiO3 [8, 6]. © 2024, CC BY.

关键词： Titanium compounds

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Hard X-ray Generation and Detection of Nanometer-Scale Localized Coherent Acoustic Wave Packets in SrTiO3 and KTaO3

arXiv

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arXiv 2023年

作者： Huang, Yijing Sun, Peihao Teitelbaum, Samuel W. Li, Haoyuan Sun, Yanwen Wang, Nan Song, Sanghoon Sato, Takahiro Chollet, Matthieu Osaka, Taito Inoue, Ichiro Duncan, Ryan A. Shin, Hyun D. Haber, Johann Zhou, Jinjian Bernardi, Marco Gu, Mingqiang Rondinelli, James M. Trigo, Mariano Yabashi, Makina Maznev, Alexei A. Nelson, Keith A. Zhu, Diling Reis, David A. Department of Physics University of Illinois at Urbana-Champaign UrbanaIL61801 United States Stanford PULSE Institute SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Department of Applied Physics Stanford University StanfordCA94305 United States Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Dipartimento di Fisica e Astronomia "Galileo Galilei" Università degli Studi di Padova Padova35131 Italy Department of Physics Arizona State University TempeAZ85287 United States Linear Coherent Light Source SLAC National Accelerator Laboratory Menlo ParkCA94025 United States RIKEN SPring-8 Center 1-1-1 Kouto Sayo-cho Sayo-gun Hyogo679-5148 Japan Department of Chemistry Massachusetts Institute of Technology CambridgeMA02139 United States Department of Applied Physics and Materials Science California Institute of Technology PasadenaCA91125 United States Guangdong Shenzhen518055 China Department of Materials Science and Engineering Northwestern University EvanstonIL60208-3108 United States

We demonstrate that the absorption of femtosecond hard x-ray pulses can excite quasi-spherical, high-amplitude and high-wavevector coherent acoustic phonon wavepackets using an all hard-x-ray pump-probe scattering experiment. The time- and momentum-resolved diffuse scattering signal is consistent with strain pulses induced by the rapid electron cascade dynamics following photoionization at uncorrelated excitation centers. We quantify key parameters of this process, including the localization size of the strain wavepacket and the photon energy conversion efficiency into elastic energy. The parameters are determined by the photoelectron and Auger electron cascade dynamics, as well as the electron-phonon interaction. In particular, we obtain the localization size of the observed strain wave packet to be 1.5 and 2.5 nm for bulk SrTiO3 and KTaO3 single crystals, even though there are no nanoscale structures or light-intensity patterns that would ordinarily be required to generate acoustic waves of wavelengths much shorter than the penetration depth. Whereas in GaAs and GaP we do not observe a signal above background. The results provide crucial information on the mechanism of x-ray energy deposition into matter and shed light on the shortest collective length scales accessible to coherent acoustic phonon generation using x-ray excitation, facilitating future x-ray study of high-wavevector acoustic phonons and thermal transport at the nanoscale. © 2023, CC BY-NC-ND.

关键词： III-V semiconductors

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Precise dd excitations and commensurate intersite Coulomb interactions in the dissimilar cuprates YBa2Cu3O7–y and La2–xSrxCuO4

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Physical Review B 2023年第13期107卷 134513-134513页

作者： Shih-Wen Huang L. Andrew Wray Yu-Cheng Shao Cheng-Yau Wu Shun-Hung Wang Jenn-Min Lee Y.-J. Chen R. W. Schoenlein C. Y. Mou Yi-De Chuang J.-Y. Lin Swiss Light Source Paul Scherrer Institut CH5232 Villigen PSI Switzerland MAX IV Laboratory Lund University P.O. Box 118 221 00 Lund Sweden Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics New York University New York New York 10003 USA National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Institute of Physics National Yang Ming Chiao Tung University Hsinchu 30010 Taiwan SLAC National Accelerator Laboratory Menlo Park California 94025 USA Physics Division National Center for Theoretical Sciences P.O. Box 2-131 Hsinchu Taiwan Center for Quantum Technology and Department of Physics National Tsing Hua University Hsinchu 300 Taiwan Institute of Physics Academia Sinica Taipei 11529 Taiwan Department of Physics National Tsing Hua University Hsinchu 30043 Taiwan Center for Emergent Functional Matter Science National Yang Ming Chiao Tung University Hsinchu 30010 Taiwan

Using high-resolution extreme ultraviolet resonant inelastic x-ray scattering (EUVRIXS) spectroscopy at the Cu M-edge, we observed doping dependent spectral shifts of interorbital (dd) excitations of YBa2Cu3O7−y and La2−xSrxCuO4. With increasing the hole doping level from undoped to optimally doped superconducting compositions, the leading edge of dd excitations is found to shift towards lower energy loss in a roughly linear trend that is irrespective of the cuprate species. The magnitude of the energy shift can be explained by including a 0.15 eV Coulomb attraction between Cu3d(x2−y2) electrons and the doped holes on the surrounding oxygens in the atomic multiplet calculations. The consistent energy shift between distinct cuprate families suggests that this intersite Coulomb interaction energy scale is relatively material independent, and provides an important reference point for understanding charge density wave phenomena in the cuprate phase diagram.

关键词： Electronic structure Pseudogap Stripes Cuprates High-temperature superconductors Thin films Inelastic X-ray scattering

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Reduction of electron-phonon coupling in warm dense iron

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Physical Review B 2020年第18期101卷 184309-184309页

作者： A. Fernandez-Pañella T. Ogitsu K. Engelhorn A. A. Correa B. Barbrel S. Hamel D. G. Prendergast D. Pemmaraju M. A. Beckwith L. J. Bae J. W. Lee B. I. Cho P. A. Heimann R. W. Falcone Y. Ping Lawrence Livermore National Laboratory Livermore California 94550 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics UC Berkeley Berkeley California 94720 USA The Molecular Foundry Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics and Photon Science Gwangju Institute of Science and Technology Gwangju Korea Linac Coherent Light Source SLAC National Accelerator Laboratory Menlo Park California 94025 USA

The electron-ion relaxation dynamics in warm dense iron were investigated by time-resolved x-ray absorption near-edge spectroscopy (XANES). A novel analysis, combining ab initio density functional theory (DFT) and two temperature model (TTM) simulations, was developed to calculate the x-ray absorption spectra as a function of delay time. Here we present experimental evidence of changes at the XAS L3 edge of iron that are consistent with the reduction of the electron-phonon coupling under warm dense matter conditions. The experimental results are in agreement with the model that takes both the electron (Te) and the ion temperature (Ti) dependence of the thermophysical properties into consideration, while models where either constant electron-phonon coupling factor (G) or only Te-dependent G are used do not agree with the observed relaxation dynamics of iron.

关键词： First-principles calculations Temperature Thermal conductivity Transport phenomena Nonequilibrium systems Warm-dense matter Femtosecond laser irradiation X-ray absorption near-edge spectroscopy

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