Evidence for Strong Electron-Phonon Coupling in Weyl Semimetals

ORAL

Abstract

Since the experimental discovery of topological semimetals (TSM) there has been a flurry of activity focused on identifying signatures of topological transport. However, many of the transport properties display behavior that is dominated by non-topological interactions with the phonon system. A deeper understanding of these TSMs therefore requires investigation of the coupling between the topological electronic system and the non-topological vibrational system. In this presentation we discuss our recent temperature dependent Raman measurements on multiple TSMs which reveal unusual temperature dependence of the linewidths. These linewidths indicate strong electron-phonon coupling in these materials, and furthermore, they show a preponderance of optical phonon decay into electron-hole pairs which seems to be a relatively general feature in TSMs.

*U.S. Department of Energy Award No. DE-SC0018675
National Science Foundation, Grant No. DMR-1709987
National Energy Research Scientific Computing Center Contract No. DE-AC02-05CH11231
Research Computing Group at Harvard University
DOE ``Photonics at Thermodynamic Limits'' Energy Frontier Research Center, Grant No. DE-SC0019140
U.S. Department of Energy, Award Number DE-SC0011978

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Presenters

  • Gavin Osterhoudt

    • Boston College

Authors

  • Gavin Osterhoudt

    • Boston College

  • Christina Garcia

    • John A. Paulson School of Engineering and Applied Sciences, Harvard University
    • Harvard University

  • Vincent Plisson

    • Boston College

  • Jennifer Coulter

    • Harvard University
    • Harvard
    • 1 John A. Paulson School of Engineering and Applied Sciences, Harvard University

  • Johannes Gooth

    • MPI for chemical physics of solids, Dresden
    • Max Planck Institute for Chemical Physics of Solid
    • Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
    • Chemical Physics of Solids, Max Planck Institute

  • Bing Shen

    • Univ of California Los Angeles
    • the school of Physics, Sun Yat-Sen University

  • Ni Ni

    • Univ of California Los Angeles
    • Physics, University of California, Los Angeles
    • Physics and Astronomy, UCLA
    • Department of Physics and Astronomy, University of California Los Angeles
    • University of California, Los Angeles
    • Department of Physics and Astronomy and California NanoSystems Institute, University of California
    • Department of Physics and Astronomy and California Nano Systems Institute, University of California, Los Angeles, CA 90095, USA
    • University of California Los Angeles
    • Department of Physics and Astronomy, University of California, Los Angeles

  • Claudia Felser

    • Max Planck Institute for Chemical Physics of Solids
    • MPI-CPfS Dresden
    • Max Planck Institute For Chemical and Physical Solids
    • MPI for chemical physics of solids, Dresden
    • Solid State Chemistry, Max Planck Institute Chemical Physics of Solids
    • Max Planck Institute
    • Max-Planck-Institute for Chemical Physics of Solids , Nöthnitzer Straße-40, 01187 Dresden, Germany
    • Max Planck Inst
    • Max Planck Dresden
    • Chemical Physics of Solids, Max Planck Institute

  • Prineha Narang

    • SEAS, Harvard University
    • Harvard University
    • John A. Paulson School of Engineering and Applied Sciences, Harvard University
    • School of Engineering and Applied Sciences, Harvard University
    • Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University
    • Harvard University; Aliro Technologies

  • Kenneth Burch

    • Boston College
    • Boston college