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Planar Hall effect from the surface of topological insulators

Author

Listed:
  • A. A. Taskin

    (University of Cologne)

  • Henry F. Legg

    (University of Cologne)

  • Fan Yang

    (University of Cologne)

  • Satoshi Sasaki

    (Osaka University
    University of Leeds)

  • Yasushi Kanai

    (Osaka University)

  • Kazuhiko Matsumoto

    (Osaka University)

  • Achim Rosch

    (University of Cologne)

  • Yoichi Ando

    (University of Cologne)

Abstract

A prominent feature of topological insulators (TIs) is the surface states comprising of spin-nondegenerate massless Dirac fermions. Recent technical advances have made it possible to address the surface transport properties of TI thin films by tuning the Fermi levels of both top and bottom surfaces. Here we report our discovery of a novel planar Hall effect (PHE) from the TI surface, which results from a hitherto-unknown resistivity anisotropy induced by an in-plane magnetic field. This effect is observed in dual-gated devices of bulk-insulating Bi2−x Sb x Te3 thin films, where the field-induced anisotropy presents a strong dependence on the gate voltage with a characteristic two-peak structure near the Dirac point. The origin of PHE is the peculiar time-reversal-breaking effect of an in-plane magnetic field, which anisotropically lifts the protection of surface Dirac fermions from backscattering. The observed PHE provides a useful tool to analyze and manipulate the topological protection of the TI surface.

Suggested Citation

  • A. A. Taskin & Henry F. Legg & Fan Yang & Satoshi Sasaki & Yasushi Kanai & Kazuhiko Matsumoto & Achim Rosch & Yoichi Ando, 2017. "Planar Hall effect from the surface of topological insulators," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01474-8
    DOI: 10.1038/s41467-017-01474-8
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    Cited by:

    1. Wei Ai & Fuyang Chen & Zhaochao Liu & Xixi Yuan & Lei Zhang & Yuyu He & Xinyue Dong & Huixia Fu & Feng Luo & Mingxun Deng & Ruiqiang Wang & Jinxiong Wu, 2024. "Observation of giant room-temperature anisotropic magnetoresistance in the topological insulator β-Ag2Te," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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