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.

*This research was partly supported by a CREST project (Grants No. JP-MJCR15F3, No. JPMJCR16F2, and No. JPMJCR20B4) from the Japan Science and Technology Agency (JST) and Japan Society for the Promotion of Science KAKENHI (Grants-in-Aid for Scienti?c Research) (Grants No. JP20H00127, No. JP20H00354, No. JP20H01834, No. JP21H05232, No. JP21H05233, No. JP21H05234, No. JP21H05235, and No. JP21H05236).

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Publication: S. Masubuchi*, M. Sakano*, Y. Tanaka* (* equally contributed) et al., Scientific Reports 12, 10936 (2022).
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