Evidence of charge density wave with anisotropic gap in monolayer VTe<sub>2</sub> film

ORAL

Abstract

We report experimental evidence of charge density wave (CDW) transition in monolayer 1T-VTe2 film. Low energy electron diffraction (LEED) measurements reveal 4×4 reconstruction peaks below transition temperature. Angle-resolved photoemission spectroscopy (ARPES) measurements reveal arc-like pockets with anisotropic CDW gaps up to 50 meV. The anisotropic CDW gap is attributed to the imperfect nesting of the CDW wave vector, and first-principles calculations reveal phonon softening at the same vector. These results suggest the important roles of both Fermi surface nesting and electron-phonon interaction in the CDW mechanism of monolayer VTe2 film.

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Presenters

  • Yuan Wang

    • State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University

Authors

  • Yuan Wang

    • State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University

  • Junhai Ren

    • State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University

  • Jiaheng Li

    • Tsinghua University
    • State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University
    • Department of Physics, Tsinghua University

  • Yujia Wang

    • State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University

  • Huining Peng

    • State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University

  • Pu Yu

    • Tsinghua University
    • State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University
    • Department of Physics, Tsinghua University

  • Wenhui Duan

    • Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
    • State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University
    • Department of physics, Tsinghua university
    • Tsinghua University

  • Shuyun Zhou

    • Tsinghua University
    • State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University