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arXiv 2024年

作者： Tanner, Christian P.N. Wall, Vivian R.K. Gababa, Mumtaz Portner, Joshua Jeong, Ahhyun Hurley, Matthew J. Leonard, Nicholas Raybin, Jonathan G. Utterback, James K. Kim, Ahyoung Fluerasu, Andrei Sun, Yanwen Möller, Johannes Zozulya, Alexey Jo, Wonhyuk Brausse, Felix Wrigley, James Boesenberg, Ulrike Lu, Wei Shayduk, Roman Youssef, Mohamed Madsen, Anders Limmer, David T. Talapin, Dmitri V. Teitelbaum, Samuel W. Ginsberg, Naomi S. Department of Chemistry University of California BerkeleyCA94720 United States Department of Chemistry James Franck Institute Pritzker School of Molecular Engineering University of Chicago ChicagoIL60637 United States Department of Physics Arizona State University TempeAZ85287 United States Brookhaven National Laboratory NSLS-II UptonNY11973 United States Linac Coherent Light Source SLAC National Accelerator Laboratory Menlo ParkCA94025 United States European X-ray Free-Electron Laser Facility Holzkoppel 4 Schenefeld22869 Germany Chemical Sciences and Materials Sciences Divisions Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Kavli Energy NanoSciences Institute University of California BerkeleyCA94720 United States Center for Nanoscale Materials Argonne National Laboratory ArgonneIL60517 United States Department of Physics University of California BerkeleyCA94720 United States Molecular Biophysics and Integrated Bioimaging Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Materials Sciences and Chemical Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States STROBE NSF Science & Technology Center BerkeleyCA94720 United States

The ability to understand and ultimately control the transformations and properties of various nanoscale systems, from proteins to synthetic nanomaterial assemblies, hinges on the ability to uncover their dynamics on their characteristic length and time scales. Here, we use MHz X-ray photon correlation spectroscopy (XPCS) to directly elucidate the characteristic microsecond-dynamics of density fluctuations of semiconductor nanocrystals (NCs), not only in a colloidal dispersion but also in a liquid phase consisting of densely packed, yet mobile, NCs with no long-range order. We find the wavevector-dependent fluctuation rates in the liquid phase are suppressed relative to those in the colloidal phase and relative to observations of densely packed repulsive particles. We show that the suppressed rates are due to a substantial decrease in the self-diffusion of NCs in the liquid phase, which we attribute to explicit attractive interactions. Using coarse-grained simulations, we find that the extracted shape and strength of the interparticle potential explains the stability of the liquid phase, in contrast to the gelation observed via XPCS in many other charged colloidal systems. This work opens the door to elucidating fast, condensed phase dynamics in complex fluids and other nanoscale soft matter, such as densely packed proteins and non-equilibrium self-assembly processes, in addition to designing microscopic strategies to avert gelation. Copyright © 2024, The Authors. All rights reserved.

关键词： Gelation

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Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains

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Physical Review B 2022年第22期106卷 224424-224424页

作者： Nanna Zhou Hagström Rahul Jangid Meera Madhavi Diego Turenne Jeffrey A. Brock Erik S. Lamb Boyan Stoychev Justine Schlappa Natalia Gerasimova Benjamin Van Kuiken Rafael Gort Laurent Mercadier Loïc Le Guyader Andrey Samartsev Andreas Scherz Giuseppe Mercurio Hermann A. Dürr Alexander H. Reid Monika Arora Hans T. Nembach Justin M. Shaw Emmanuelle Jal Eric E. Fullerton Mark W. Keller Roopali Kukreja Stefano Bonetti Thomas J. Silva Ezio Iacocca Department of Physics Stockholm University 106 91 Stockholm Sweden Department of Materials Science and Engineering University of California Davis Davis California 95616 USA Department of Physics and Astronomy Uppsala University 75120 Uppsala Sweden Center for Memory and Recording Research University of California San Diego La Jolla California 92037 USA Department of Physics University of California San Diego La Jolla California 92037 USA European XFEL Holzkoppel 4 22869 Schenefeld Germany Linac Coherent Light Source SLAC National Accelerator Laboratory Menlo Park California 94025 USA Quantum Electromagnetics Division National Institute of Standards and Technology Boulder Colorado 80305 USA Department of Physics University of Colorado Boulder Colorado 80309 USA Associate of the National Institute of Standards and Technology Boulder Colorado 80305 USA Sorbonne Université CNRS Laboratoire de Chimie Physique–Matière et Rayonnement LCPMR Paris 75005 France Department of Molecular Sciences and Nanosystems Ca' Foscari University of Venice 30172 Venezia Italy Department of Mathematics Physics and Electrical Engineering Northumbria University Newcastle upon Tyne NE1 8ST United Kingdom Center for Magnetism and Magnetic Nanostructures University of Colorado Colorado Springs Colorado Springs Colorado 80918 USA

Femtosecond optical pumping of magnetic materials has been used to achieve ultrafast switching and recently to nucleate symmetry-broken magnetic states. However, when the magnetic order parameter already presents a broken-symmetry state, such as a domain pattern, the dynamics are poorly understood and consensus remains elusive. Here, we resolve the controversies in the literature by studying the ultrafast response of magnetic domain patterns with varying degrees of translation symmetry with ultrafast x-ray resonant scattering. A data analysis technique is introduced to disentangle the isotropic and anisotropic components of the x-ray scattering. We find that the scattered intensity exhibits a radial shift restricted to the isotropic component, indicating that the far-from-equilibrium magnetization dynamics are intrinsically related to the spatial features of the domain pattern. Our results suggest alternative pathways for the spatiotemporal manipulation of magnetism via far-from-equilibrium dynamics and by carefully tuning the ground-state magnetic textures.

关键词： Magnetic domains Magnetism Ultrafast demagnetization Ultrafast magnetization dynamics Coherent X-ray scattering Ultrafast femtosecond pump probe

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Activity Report of the Second African Conference on Fundamental and Applied Physics, ACP2021

arXiv

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arXiv 2022年

作者： Assamagan, Kétévi A. Abah, Obinna Abebe, Amare Avery, Stephen Boye, Diallo Boye-Faye, Arame Cecire, Kenneth Chabab, Mohamed Chigome, Samuel Connell, Simon Cyulinyana, Mary Chantal Dalton, Mark Macrae Darve, Christine Drissi, Lalla Btissam Fassi, Farida Goelach, Ulrich Gouighri, Mohamed Gueye, Paul Haddad, Sonia von der Heyden, Bjorn Ka, Oumar Kamel, Gihan Kenmoe, Stéphane Kobor, Diouma Krüger, Tjaart Laassiri, Mounia Leeuw, Lerothodi Llacer, Maria Moreno Mulilo, Benard Musembi, Robinson Mwewa, Chilufya Nellist, Clara Norris, Lawrence Nibamureke, Marie Clémentine Pović, Mirjana Severini, Horst Silari, Marco Fankam, Bertrand Tchanche Usman, Iyabo Yitamben, Esmeralda Yu, Jae Brookhaven National Laboratory United States Newcastle University United Kingdom North-West University South Africa University of Pennsylvania United States Cheikh Anta Diop University Senegal Senegal University of Notre Dame United States Mohamed V University Morocco Botswana Institute for Technology Research and Innovation Botswana Botswana University of Johannesburg South Africa University of Rwanda Rwanda Rwanda Thomas Jefferson National Accelerator Facility United States European Spallation Source Sweden Institut Pluridisciplinaire Hubert Curien CNRS Strasbourg France Ibn-Tofail University Morocco Michigan State University United States University of Tunis El Manar Tunisia Stellenbosch University South Africa SESAME Jordan Helwan University Egypt Universitaet Duisburg-Essen Germany Université Assane Seck de Ziguinchor Senegal Senegal University of Pretoria South Africa University of the Western Cape South Africa University of Valencia Spain University of Zambia Zambia University of Nairobi Kenya Radboud University and Nikhef Netherlands African Light Source Foundation United States Ethiopian Space Science and Technology Institute Ethiopia University of Oklahoma United States CERN Switzerland Université Alioune Diop Senegal Senegal University of the Witwatwersrand South Africa Merck Group Merck KGaA Germany University of Texas Arlington United States

The African School of Fundamental Physics and Applications, also known as the African School of Physics (ASP), was initiated in 2010, as a three-week biennial event, to offer additional training in fundamental and applied physics to African students with a minimum of three-year university education. Since its inception, ASP has grown to be much more than a school. ASP has become a series of activities and events with directed ethos towards physics as an engine for development in Africa. One such activity of ASP is the African Conference on Fundamental and Applied Physics (ACP). The first edition of ACP took place during the 2018 edition of ASP at the University of Namibia in Windhoek. In this paper, we report on the second edition of ACP, organized on March 7–11, 2022, as a virtual event. © 2022, CC BY-NC-ND.

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Unraveling the Orbital Physics in a Canonical Orbital System KCuF3

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Physical Review Letters 2021年第10期126卷 106401-106401页

作者： Jiemin Li Lei Xu Mirian Garcia-Fernandez Abhishek Nag H. C. Robarts A. C. Walters X. Liu Jianshi Zhou Krzysztof Wohlfeld Jeroen van den Brink Hong Ding Ke-Jin Zhou Diamond Light Source Harwell Campus Didcot OX11 0DE United Kingdom Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China Institute for Theoretical Solid State Physics IFW Dresden Helmholtzstrasse 20 D-01069 Dresden Germany H. H. Wills Physics Laboratory University of Bristol Bristol BS8 1TL United Kingdom School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China The Materials Science and Engineering Program Mechanical Engineering University of Texas at Austin Austin Texas 78712 USA Institute of Theoretical Physics Faculty of Physics University of Warsaw Pasteura 5 PL-02093 Warsaw Poland Institute for Theoretical Physics and Würzburg-Dresden Cluster of Excellence ct.qmat TU Dresden 01069 Dresden Germany

We explore the existence of the collective orbital excitations, orbitons, in the canonical orbital system KCuF3 using the Cu L3-edge resonant inelastic x-ray scattering. We show that the nondispersive high-energy peaks result from the Cu2+ dd orbital excitations. These high-energy modes display good agreement with the ab initio quantum chemistry calculation, indicating that the dd excitations are highly localized. At the same time, the low-energy excitations present clear dispersion. They match extremely well with the two-spinon continuum following the comparison with Müller ansatz calculations. The localized dd excitations and the observation of the strongly dispersive magnetic excitations suggest that the orbiton dispersion is below the resolution detection limit. Our results can reconcile with the strong local Jahn-Teller effect in KCuF3, which predominantly drives orbital ordering.

关键词： Orbital order Mott insulators Crystal-field theory Resonant inelastic x-ray scattering

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Site-specific structure at multiple length scales in kagome quantum spin liquid candidates

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Physical Review Materials 2020年第12期4卷 124406-124406页

作者： Rebecca W. Smaha Idris Boukahil Charles J. Titus Jack Mingde Jiang John P. Sheckelton Wei He Jiajia Wen John Vinson Suyin Grass Wang Yu-Sheng Chen Simon J. Teat Thomas P. Devereaux C. Das Pemmaraju Young S. Lee Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo Park California 94025 USA Department of Chemistry Stanford University Stanford California 94305 USA Department of Physics Stanford University Stanford California 94305 USA Theory Institute for Materials and Energy Spectroscopies SLAC National Accelerator Laboratory Menlo Park California 94025 USA Department of Applied Physics Stanford University Stanford California 94305 USA Department of Materials Science and Engineering Stanford University Stanford California 94305 USA Material Measurement Laboratory National Institute of Standards and Technology 100 Bureau Drive Gaithersburg Maryland 20899 USA NSF's ChemMatCARS Center for Advanced Radiation Sources c/o Advanced Photon Source/ANL The University of Chicago Argonne Illinois 60439 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Realizing a quantum spin liquid (QSL) ground state in a real material is a leading issue in condensed matter physics research. In this pursuit, it is crucial to fully characterize the structure and influence of defects, as these can significantly affect the fragile QSL physics. Here, we perform a variety of cutting-edge synchrotron x-ray scattering and spectroscopy techniques, and we advance new methodologies for site-specific diffraction and L-edge Zn absorption spectroscopy. The experimental results along with our first-principles calculations address outstanding questions about the local and long-range structures of the two leading kagome QSL candidates, Zn-substituted barlowite Cu3ZnxCu1−x(OH)6FBr and herbertsmithite Cu3Zn(OH)6Cl2. On all length scales probed, there is no evidence that Zn substitutes onto the kagome layers, thereby preserving the QSL physics of the kagome lattice. Our calculations show that antisite disorder is not energetically favorable and is even less favorable in Zn-barlowite compared to herbertsmithite. Site-specific x-ray diffraction measurements of Zn-barlowite reveal that Cu2+ and Zn2+ selectively occupy distinct interlayer sites, in contrast to herbertsmithite. Using the first measured Zn L-edge inelastic x-ray absorption spectra combined with calculations, we discover a systematic correlation between the loss of inversion symmetry from pseudo-octahedral (herbertsmithite) to trigonal prismatic coordination (Zn-barlowite) with the emergence of a new peak. Overall, our measurements suggest that Zn-barlowite has structural advantages over herbertsmithite that make its magnetic properties closer to an ideal QSL candidate: its kagome layers are highly resistant to nonmagnetic defects while the interlayers can accommodate a higher amount of Zn substitution.

关键词： Quantum spin liquid Kagome lattice Crystallography First-principles calculations Resonant elastic x-ray scattering Resonant inelastic x-ray scattering X-ray absorption spectroscopy X-ray techniques

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Symmetry-protected electronic metastability in an optically driven cuprate ladder

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Nature materials 2025年 2025 Jun 3页

作者： Hari Padma Filippo Glerean Sophia F R TenHuisen Zecheng Shen Haoxin Wang Luogen Xu Joshua D Elliott Christopher C Homes Elizabeth Skoropata Hiroki Ueda Biaolong Liu Eugenio Paris Arnau Romaguera Byungjune Lee Wei He Yu Wang Seng Huat Lee Hyeongi Choi Sang-Youn Park Zhiqiang Mao Matteo Calandra Hoyoung Jang Elia Razzoli Mark P M Dean Yao Wang Matteo Mitrano Department of Physics Harvard University Cambridge MA USA. hpadmanabhan@g.harvard.edu. Department of Physics Harvard University Cambridge MA USA. Department of Applied Physics Harvard University Cambridge MA USA. Department of Chemistry Emory University Atlanta GA USA. Department of Physics The Chinese University of Hong Kong Hong Kong China. Diamond Light Source Didcot UK. National Synchrotron Light Source II Brookhaven National Laboratory Upton NY USA. PSI Center for Photon Science Paul Scherrer Institute Villigen Switzerland. Department of Physics Pohang University of Science and Technology Pohang Korea. Max Planck POSTECH/Korea Research Initiative Center for Complex Phase Materials Pohang Korea. Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Upton NY USA. Department of Physics Pennsylvania State University University Park PA USA. 2D Crystal Consortium Materials Research Institute Pennsylvania State University University Park PA USA. Pohang Accelerator Laboratory (PAL) Pohang University of Science and Technology Pohang South Korea. Department of Physics University of Trento Povo Italy. Department of Chemistry Emory University Atlanta GA USA. yao.wang@emory.edu. Department of Physics Harvard University Cambridge MA USA. mmitrano@g.harvard.edu.

Optically excited quantum materials exhibit non-equilibrium states with remarkable emergent properties, but these phenomena are usually transient, decaying on picosecond timescales and limiting practical applications. Advancing the design and control of non-equilibrium phases requires the development of targeted strategies to achieve long-lived, metastable phases. Here we report the discovery of symmetry-protected electronic metastability in the model cuprate ladder SrCuO. Using femtosecond resonant X-ray scattering and spectroscopy, we show that this metastability is driven by a transfer of holes from chain-like charge reservoirs into the ladders. This ultrafast charge redistribution arises from the optical dressing and activation of a hopping pathway that is forbidden by symmetry at equilibrium. Relaxation back to the ground state is, hence, suppressed after the pump coherence dissipates. Our findings highlight how dressing materials with electromagnetic fields can dynamically activate terms in the electronic Hamiltonian, and provide a rational design strategy for non-equilibrium phases of matter.

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Coulombically-stabilized oxygen hole polarons enable fully reversible oxygen redox

arXiv

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arXiv 2020年

作者： Abate, Iwnetim I. Pemmaraju, C. Das Kim, Se Young Hsu, Kuan H. Sainio, Sami Moritz, Brian Vinson, John Toney, Michael F. Yang, Wanli Gent, William E. Devereaux, Thomas P. Nazar, Linda F. Chueh, William C. Department of Materials Science and Engineering Stanford University 496 Lomita Mall StanfordCA94305 United States Stanford Institute for Materials & Energy Sciences SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo ParkCA94025 United States Department of Chemistry Waterloo Institute for Nanotechnology University of Waterloo 200 University Avenue West WaterlooONN2L 3G1 Canada Stanford Synchrotron Radiation Light source SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo ParkCA94025 United States Material Measurement Laboratory National Institute of Standards and Technology GaithersburgMD20899 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

Stabilizing high-valent redox couples and exotic electronic states necessitate an understanding of the stabilization mechanism. In oxides, whether they are being considered for energy storage or computing, highly oxidized oxide-anion species rehybridize to form short covalent bonds and are related to significant local structural distortions. In intercalation oxide electrodes for batteries, while such reorganization partially stabilizes oxygen redox, it also gives rise to substantial hysteresis. In this work, we investigate oxygen redox in layered Na2-XMn3O7, a positive electrode material with ordered Mn vacancies. We show that coulombic interactions between oxidized oxide-anions and the interlayer Na vacancies can disfavor rehybridization and stabilize hole polarons on oxygen at 4.2 V vs. Na/Na+. These coulombic interactions provide thermodynamic energy saving as large as O-O covalent bonding and enable ~ 40 mV voltage hysteresis over multiple electrochemical cycles with negligible voltage fade. Our results establish a complete picture of redox energetics by highlighting the role of coulombic interactions across several atomic distances and suggest avenues to stabilize highly oxidized oxygen for applications in energy storage and beyond. Copyright © 2020, The Authors. All rights reserved.

关键词： Oxygen

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

arXiv

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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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Nonsymmorphic Symmetry-Protected Band Crossings in a Square-Net Metal PtPb4

arXiv

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arXiv 2022年

作者： Wu, Han Hallas, Alannah M. Cai, Xiaochan Huang, Jianwei Oh, Ji Seop Loganathan, Vaideesh Weiland, Ashley McCandless, Gregory T. Chan, Julia Y. Mo, Sung-Kwan Lu, Donghui Hashimoto, Makoto Denlinger, Jonathan Birgeneau, Robert J. Nevidomskyy, Andriy H. Li, Gang Morosan, Emilia Yi, Ming Department of Physics and Astronomy Rice Center for Quantum Materials Rice University HoustonTX77005 United States Department of Physics and Astronomy Quantum Matter Institute University of British Columbia VancouverBCV6T 1Z1 Canada School of Physical Science and Technology ShanghaiTech University Shanghai201210 China Department of Physics University of California Berkeley BerkeleyCA94720 United States Department of Chemistry & Biochemistry University of Texas at Dallas RichardsonTX75080 United States Department of Chemistry and Biochemistry Baylor University WacoTX76798 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Materials Science and Engineering University of California BerkeleyCA United States ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Shanghai201210 China

Topological semimetals with symmetry-protected band crossings have emerged as a rich landscape to explore intriguing electronic phenomena. Nonsymmorphic symmetries in particular have been shown to play an important role in protecting the crossings along a line (rather than a point) in momentum space. Here we report experimental and theoretical evidence for Dirac nodal line crossings along the Brillouin zone boundaries in PtPb4, arising from the nonsymmorphic symmetry of its crystal structure. Interestingly, while the nodal lines would remain gapless in the absence of spin-orbit coupling (SOC), the SOC in this case plays a detrimental role to topology by lifting the band degeneracy everywhere except at a set of isolated points. Nevertheless, the nodal line is observed to have a bandwidth much smaller than that found in density functional theory (DFT). Our findings reveal PtPb4to be a material system with narrow crossings approximately protected by non-symmorhpic crystalline symmetries. Copyright © 2022, The Authors. All rights reserved.

关键词： Topology

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Identification of a Critical Doping for Charge Order Phenomena in Bi-2212 Cuprates via RIXS

arXiv

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arXiv 2022年

作者： Lu, Haiyu Hashimoto, Makoto Chen, Su-Di Ishida, Shigeyuki Song, Dongjoon Eisaki, Hiroshi Nag, Abhishek Garcia-Fernandez, Mirian Arpaia, Riccardo Ghiringhelli, Giacomo Braicovich, Lucio Zaanen, Jan Moritz, Brian Kummer, Kurt Brookes, Nicholas B. Zhou, Ke-Jin Shen, Zhi-Xun Devereaux, Thomas P. Lee, Wei-Sheng Stanford Institute for Materials and Energy Sciences Slac National Accelerator Laboratory 2575 Sand Hill Road Menlo ParkCA94025 United States Department of Physics Stanford University StanfordCA94305 United States Department of Applied Physics Stanford University StanfordCA94305 United States National Institute of Advanced Industrial Science and Technology Ibaraki Tsukuba305-8568 Japan Diamond Light Source Harwell Campus DidcotOX11 0DE United Kingdom Dipartimento di Fisica Politecnico di Milano Piazza Leonardo da Vinci 32 MilanoI-20133 Italy Department of Microtechnology and Nanoscience Chalmers University of Technology GöteborgSE-41296 Sweden CNR-SPIN Dipartimento di Fisica Politecnico di Milano Piazza Leonardo da Vinci 32 MilanoI-20133 Italy B.P. 220 Grenoble CedexF-38043 France Instituut-Lorentz for Theoretical Physics Leiden University Niels Bohrweg 2 Leiden2333 CA Netherlands Geballe Laboratory for Advanced Materials Stanford University StanfordCA United States Department of Materials Science and Engineering Stanford University StanfordCA94305 United States

Identifying quantum critical points (QCPs) and their associated fluctuations may hold the key to unraveling the unusual electronic phenomena observed in cuprate superconductors. Recently, signatures of quantum fluctuations associated with charge order (CO) have been inferred from the anomalous enhancement of CO excitations that accompany the reduction of the CO order parameter in the superconducting state. To gain more insight about the interplay between CO and superconductivity, here we investigate the doping dependence of this phenomenon throughout the Bi-2212 cuprate phase diagram using resonant inelastic x-ray scattering (RIXS) at the Cu L3-edge. As doping increases, the CO wavevector decreases, saturating at a commensurate value of 0.25 r.l.u. beyond a characteristic doping pc, where the correlation length becomes shorter than the apparent periodicity (4a0). Such behavior is indicative of the fluctuating nature of the CO;and the proliferation of CO excitations in the superconducting state also appears strongest at pc, consistent with expected behavior at a CO QCP. Intriguingly, pcappears to be near optimal doping, where the superconducting transition temperature Tcis maximal. Copyright © 2022, The Authors. All rights reserved.

关键词： Superconducting transition temperature

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