Evolution of Higgs and Leggett modes with pressure in NbSe<sub>2</sub>

ORAL

Abstract

The coexistence of the charge density wave and superconducting phases has been a subject of much recent interest. 2H-NbSe2 is a model superconductor with a charge density wave. By using Raman scattering technique, we show how the competition between the charge density wave and superconductivity in 2H-NbSe2 can be tuned by temperature and pressure. We also report the experimental observation of a Higgs mode together with an additional Leggett mode and their evolution with pressure. The implication of these collective excitation modes to the understanding of unconventional superconductivity is discussed.

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Presenters

  • Zi-Yu Cao

    • Center for High-Pressure Science & Technology Advanced Research

Authors

  • Zi-Yu Cao

    • Center for High-Pressure Science & Technology Advanced Research

  • Kai Zhang

    • Center for High Pressure Science & Technology Advanced Research (HPSTAR)
    • Center for High Pressure Science & Technology Advanced Research
    • Center for High-Pressure Science & Technology Advanced Research

  • Xiao-Jia Chen

    • Center for High Pressure Science and Technology Advanced Research
    • Center for High Pressure Science & Technology Advanced Research (HPSTAR)
    • Center for High Pressure Science & Technology Advanced Research
    • Center for High-Pressure Science & Technology Advanced Research

  • Xiao-Jun Yang

    • Department of Physics, Zhejiang University

  • Zhu-An Xu

    • Department of Physics, Zhejiang University

  • Alexander Goncharov

    • Geophysical Laboratory, Carnegie Institution of Washington