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Evidence for topological type-II Weyl semimetal WTe2

Author

Listed:
  • Peng Li

    (Physical Science and Engineering Division (PSE))

  • Yan Wen

    (Physical Science and Engineering Division (PSE))

  • Xin He

    (Physical Science and Engineering Division (PSE))

  • Qiang Zhang

    (Physical Science and Engineering Division (PSE))

  • Chuan Xia

    (Physical Science and Engineering Division (PSE))

  • Zhi-Ming Yu

    (Singapore University of Technology and Design)

  • Shengyuan A. Yang

    (Singapore University of Technology and Design)

  • Zhiyong Zhu

    (KAUST Supercomputing Laboratory (KSL))

  • Husam N. Alshareef

    (Physical Science and Engineering Division (PSE))

  • Xi-Xiang Zhang

    (Physical Science and Engineering Division (PSE))

Abstract

Recently, a type-II Weyl fermion was theoretically predicted to appear at the contact of electron and hole Fermi surface pockets. A distinguishing feature of the surfaces of type-II Weyl semimetals is the existence of topological surface states, so-called Fermi arcs. Although WTe2 was the first material suggested as a type-II Weyl semimetal, the direct observation of its tilting Weyl cone and Fermi arc has not yet been successful. Here, we show strong evidence that WTe2 is a type-II Weyl semimetal by observing two unique transport properties simultaneously in one WTe2 nanoribbon. The negative magnetoresistance induced by a chiral anomaly is quite anisotropic in WTe2 nanoribbons, which is present in b-axis ribbon, but is absent in a-axis ribbon. An extra-quantum oscillation, arising from a Weyl orbit formed by the Fermi arc and bulk Landau levels, displays a two dimensional feature and decays as the thickness increases in WTe2 nanoribbon.

Suggested Citation

  • Peng Li & Yan Wen & Xin He & Qiang Zhang & Chuan Xia & Zhi-Ming Yu & Shengyuan A. Yang & Zhiyong Zhu & Husam N. Alshareef & Xi-Xiang Zhang, 2017. "Evidence for topological type-II Weyl semimetal WTe2," Nature Communications, Nature, vol. 8(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-02237-1
    DOI: 10.1038/s41467-017-02237-1
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    Cited by:

    1. Jae-Keun Kim & Kun-Rok Jeon & Pranava K. Sivakumar & Jaechun Jeon & Chris Koerner & Georg Woltersdorf & Stuart S. P. Parkin, 2024. "Intrinsic supercurrent non-reciprocity coupled to the crystal structure of a van der Waals Josephson barrier," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    2. Yu Pan & Bin He & Toni Helm & Dong Chen & Walter Schnelle & Claudia Felser, 2022. "Ultrahigh transverse thermoelectric power factor in flexible Weyl semimetal WTe2," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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