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Time-resolved x-ray diffraction study of acoustic phonons in TaAs

ORAL

Abstract

We utilized femtosecond x-ray pulses to investigate acoustic phonon oscillations in TaAs. We observed that time-resolved x-ray diffraction reveals coherent phonon oscillations of binary acoustic modes in truncation rod scattering. The phonon oscillations correspond to the transverse and longitudinal acoustic modes propagating along the surface normal vector. We suggest that the off-axis orientation of the surface normal makes it possible to observe the transverse phonon oscillation, in contrast to conventional laser-induced acoustic phonon oscillations due to a single longitudinal mode. We also found an asymmetric Fano-like feature in the longitudinal phonon oscillations, suggestive of strong electron-phonon coupling in TaAs.

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Presenters

  • Min-Cheol Lee

    Los Alamos National Laboratory

Authors

  • Min-Cheol Lee

    Los Alamos National Laboratory

  • Nicholas Sirica

    Los Alamos National Laboratory, Center for Integrated Nanotechnologies, Los Alamos National Laboratory

  • Samuel W. Teitelbaum

    Stanford PULSE Institute, SLAC National Accelerator Laboratory

  • Mariano Trigo

    Stanford PULSE Institute, SLAC National Accelerator Laboratory, SLAC - Natl Accelerator Lab

  • Gilberto Antonio de la Pean Munoz

    Stanford PULSE Institute, SLAC National Accelerator Laboratory

  • Viktor Krapivin

    Department of Applied Physics, Stanford University

  • Yijing Huang

    Department of Applied Physics, Stanford University

  • David A Reis

    Department of Applied Physics, Stanford University

  • Alexei Maznev

    Department of Chemistry, Massachusetts Institute of Technology

  • Jiaojian Shi

    Department of Chemistry, Massachusetts Institute of Technology

  • Keith Adam Nelson

    Department of Chemistry, Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT, Chemistry, MIT

  • Roxanne Tutchton

    Los Alamos National Laboratory

  • Jian-Xin Zhu

    Los Alamos National Laboratory, Los Alamos National Lab, Los Alamos Natl Lab, Theoretical Division, Los Alamos National Laboratory

  • Xianggang Qiu

    Institute of Physics, Chinese Academy of Sciences, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • Dzmitry Yarotski

    Los Alamos National Laboratory

  • Rohit P Prasankumar

    Los Alamos National Laboratory, Center for Integrated Nanotechnologies, Los Alamos National Laboratory