High-temperature charge density wave in rare-earth tetratelluride

ORAL

Abstract

Charge density waves (CDWs) are broken-symmetry ground states that are driven by the electron-phonon interaction in quasi one-dimensional (1D) or two-dimensional (2D) metals. The subject has generated considerable interest as it offers important insights into electron-phonon physics, its competition or coexistence with other ground states, as well as its potential role in the phase diagram of high-Tc cuprates. Recently, a CDW state was found in a newly synthesized quasi-2D compound, rare-earth tetratelluride. Here, by high-resolution angle-resolved photoemission spectroscopy, we demonstrate that in the CDW state, the Fermi surface is fully gapped but the gap size is momentum-dependent. Surprisingly, the CDW persists to above 400 K, providing a remarkable system for the room-temperature study of 2D semiconductors with collective electronic states.

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Presenters

  • Baiqing Lyu

    • Massachusetts Institute of Technology MIT

Authors

  • Baiqing Lyu

    • Massachusetts Institute of Technology MIT

  • Alfred Zong

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology
    • Physics, MIT

  • Dong Wu

    • International Center for Quantum Materials, Peking University

  • Makoto Hashimoto

    • SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource
    • Stanford Synchrotron Radiation Lightsource
    • SSRL, SLAC National Laboratory
    • SLAC National Accelerator Laboratory
    • Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory

  • Donghui Lu

    • SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource
    • Stanford Synchrotron Radiation Lightsource
    • SLAC National Accelerator Laboratory
    • SLAC - Natl Accelerator Lab
    • Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory

  • Su-Di Chen

    • Stanford University
    • Applied Physics, Stanford University
    • SLAC National Accelerator Laboratory
    • Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University
    • Stanford Univ

  • Man Li

    • Shanghai Synchrotron Radiation Facility

  • Yaobo Huang

    • Shanghai Synchrotron Radiation Facility

  • Nan Lin Wang

    • International Center for Quantum Materials, Peking University

  • Nuh Gedik

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology
    • Physics, MIT