ARPES study on the electronic structure of VTe2 with double zigzag chains

ORAL

Abstract

Layered transition metal dichalcogenide (TMDC) has been a well-known system to host a variety of charge density waves (CDW) reflecting its quasi-two-dimensionality. More recently, there has been increasing interest in spin-orbit coupling effect and topological aspects of TMDC. VTe2 has a trigonal CdI2-type structure (so-called 1T phase) at high temperature, consisting of trigonal layers formed by edge-sharing VTe6 octahedra. Below ~485 K, it undergoes a peculiar structural phase transition to the monoclinic 1T” phase. In this phase, VTe2 exhibits the 3×1×3 superstructure characterized by the formation of double zigzag chains of vanadium [1], which has been discussed in terms of CDW. In this talk, we report on the peculiar modification of the electronic structures via the 1T-1T” phase transition clarified by utilizing angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations.
[1] K. D. Bronsema et al., Solid State Commun. 40, 629 (1981).

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Presenters

  • Mitsuishi Natsuki

    The University of Tokyo

Authors

  • Mitsuishi Natsuki

    The University of Tokyo

  • Yusuke Sugita

    The University of Tokyo, University of Tokyo

  • Saeed Bahramy

    The University of Tokyo, Department of Applied Physics, The University of Tokyo

  • Manabu Kamitani

    The University of Tokyo, RIKEN Center for Emergent Matter Science (CEMS)

  • Tatsuya Sonobe

    The University of Tokyo

  • Masato Sakano

    The University of Tokyo, Department of Applied Physics, The University of Tokyo

  • Takahiro Shimojima

    RIKEN CEMS

  • Koji Horiba

    KEK-PF

  • Hiroshi Kumigashira

    KEK-PF

  • Kazuaki Taguchi

    Hiroshima University

  • Kouji Miyamoto

    Hiroshima University

  • Taichi Okuda

    Hiroshima University, Hiroshima Synchrotron Radiation Center, Hiroshima University, Japan

  • Shintaro Ishiwata

    The University of Tokyo, University of Tokyo and JST-PRESTO

  • Yukitoshi Motome

    Department of Applied Physics, University of Tokyo, Department of Applied Physics, The University of Tokyo, The University of Tokyo, University of Tokyo, Applied Physics, University of Tokyo

  • Kyoko Ishizaka

    The University of Tokyo, Department of Applied Physics, The University of Tokyo