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      Ultrafast X-Ray Scattering Reveals Composite Amplitude Collective Mode in the Weyl Charge Density Wave Material (TaSe_{4})_{2}I.

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          Abstract

          We report ultrafast x-ray scattering experiments of the quasi-1D charge density wave (CDW) material (TaSe_{4})_{2}I following ultrafast infrared photoexcitation. From the time-dependent diffraction signal at the CDW sidebands we identify a 0.11 THz amplitude mode derived primarily from a transverse acoustic mode of the high-symmetry structure. From our measurements we determine that this mode interacts with the valence charge indirectly through another collective mode, and that the CDW system in (TaSe_{4})_{2}I has a composite nature supporting multiple dynamically active structural degrees of freedom.

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          Author and article information

          Journal
          Journal ID (iso-abbrev): Phys Rev Lett
          Title: Physical review letters
          Publisher: American Physical Society (APS)
          ISSN (Electronic): 1079-7114
          ISSN (Print): 0031-9007
          Publication date (Electronic): Aug 18 2023
          Volume: 131
          Issue: 7
          Affiliations
          [1 ] Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
          [2 ] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
          [3 ] Department of Applied Physics, Stanford University, Stanford, California 94305, USA.
          [4 ] Department of Photon Science, Stanford University, Stanford, California 94305, USA.
          [5 ] Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
          [6 ] Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
          [7 ] Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
          [8 ] Department of Physics, Arizona State University, Tempe, Arizona 85281, USA.
          [9 ] RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan.
          [10 ] Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
          [11 ] Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
          [12 ] Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan.
          Article
          DOI: 10.1103/PhysRevLett.131.076901
          PubMed ID: 37656841
          SO-VID: c9e6574e-7e70-4300-b150-f2159feae91e
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