Observation of spin polarized surface states in polar Weyl semimetal MoTe2

ORAL

Abstract

Since the theoretical prediction of the low temperature phase as a type-II Weyl semimetal, the electronic structure of β-MoTe2 has been actively studied by angle-resolved photoelectron spectroscopy. Until now, some segment-like band features resembling Fermi arcs are experimentally observed, which are indicative of the topological surface states connecting the bulk Weyl nodes. However, the band dispersions near the Fermi level is complicated, and clear interpretation is not easy. Here we investigate the spin polarizations of the Fermi arc features for both polar terminations by utilizing the high-resolution spin and angle-resolved photoelectron spectroscopy (SARPES). For respective surface terminations, the different patterns and spin polarizations of Fermi arcs are clearly observed. In the presentation, we will compare the result with the first-principles calculation and discuss the details of the spin polarized surface states.

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Presenters

  • Yuma Tanaka

    • Department of Applied Physics, University of Tokyo

Authors

  • Yuma Tanaka

    • Department of Applied Physics, University of Tokyo

  • Mohammad Saeed Bahramy

    • Univ of Tokyo
    • Department of Applied Physics, University of Tokyo

  • Hidefumi Takahashi

    • Graduate School of Engineering Science,Osaka University

  • Kenta Kuroda

    • Univ of Tokyo
    • University of Tokyo
    • Institute for Solid State Physics, University of Tokyo

  • Koichiro Yaji

    • University of Tokyo
    • Institute for Solid State Physics, University of Tokyo
    • Institute for Solid State Physics, The University of Tokyo

  • Ayumi Harasawa

    • University of Tokyo
    • Institute for Solid State Physics, University of Tokyo

  • Takeshi Kondo

    • Univ of Tokyo
    • University of Tokyo
    • Institute for Solid State Physics, University of Tokyo

  • Shik Shin

    • Univ of Tokyo
    • University of Tokyo
    • Institute for Solid State Physics, University of Tokyo
    • Univ of Tokyo-Kashiwanoha
    • Institute for Solid State Physics, The University of Tokyo

  • Shintaro Ishiwata

    • Graduate School of Engineering Science,Osaka University

  • Kyoko Ishizaka

    • Univ of Tokyo
    • Department of Applied Physics, University of Tokyo