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Observation on the odd-even layer-number effect in WTe<sub>2</sub> with laser-based micro-ARPES

ORAL

Abstract

We investigate the electronic band dispersions of multilayer WTe2 (2–5 layers), by performing laser-based micro-focused angle-resolved photoelectron spectroscopy on exfoliated ?akes sorted by number of layers (n). We observe the 30–70-meV spin splitting of valence bands manifesting in even n as a signature of stronger structural asymmetry. Our result fully demonstrates the possibility of the large energy-scale band and spin manipulation through the ?nite-n stacking procedure. The developed sample fabrication procedure for ARPES in this study should be applicable to a wide range of micro-flakes samples, such as heterostructures and twisted materials.

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Publication: S. Masubuchi*, M. Sakano*, Y. Tanaka* (* equally contributed) et al., Scientific Reports 12, 10936 (2022). <br>M. Sakano*, Y. Tanaka*, S. Masubuchi*, (* equally contributed) et al., Phys. Rev. Research 4, 023247 (2022).

Presenters

  • Masato Sakano

    Univ of Tokyo

Authors

  • Masato Sakano

    Univ of Tokyo

  • Satoru Masubuchi

    Univ of Tokyo, Institute of Industrial Science, University of Tokyo

  • Yuma Tanaka

    Univ of Tokyo

  • Shota Okazaki

    Tokyo Inst of Tech - Yokohama

  • Takuya Nomoto

    Univ of Tokyo, The University of Tokyo, RCAST, Univ of Tokyo, University of Tokyo

  • Atsushi Oshima

    Univ of Tokyo

  • Kenji Watanabe

    National Institute for Materials Science, Research Center for Functional Materials, National Institute of Materials Science, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan, NIMS, Research Center for Functional Materials, National Institute for Materials Science, National Institute for Materials Science, Japan, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan, NIMS Japan

  • Takashi Taniguchi

    National Institute for Materials Science, Kyoto Univ, International Center for Materials Nanoarchitectonics, National Institute of Materials Science, Kyoto University, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, National Institute for Materials Science, Japan, National Institute For Materials Science, NIMS, National Institute for Material Science, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan, NIMS Japan

  • Ryotaro Arita

    The University of Tokyo, Univ of Tokyo, Univ of Tokyo, RIKEN CEMS, University of Tokyo, the University of Tokyo

  • Takao Sasagawa

    Tokyo Inst of Tech - Yokohama, Tokyo Institute of Technology

  • Tomoki Machida

    Univ of Tokyo, Institute of Industrial Science, University of Tokyo

  • Kyoko Ishizaka

    Univ of Tokyo, The University of Tokyo, University of Tokyo