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Topological Thermal Hall Effect of Magnons in Magnetic Skyrmion Lattice

ORAL

Abstract

Topological transports of fermions are governed by the Chern numbers of the energy bands lying below the Fermi energy. For bosons, e.g. phonons and magnons in a crystal, topological transport is dominated by the Chern number of the lowest energy band when the band gap is comparable to the thermal energy. Here, we demonstrate the presence of topological transport by bosonic magnons in a lattice of magnetic skyrmions - topological defects formed by a vortex-like texture of spins. We find a distinct thermal Hall signal in the magnetic skyrmion phase of an insulating polar magnet GaV4Se8, identified as the topological thermal Hall effect of magnons governed by the Chern number of the lowest energy band of the magnons in a triangular lattice of magnetic skyrmions. Our findings lay a foundation for studying topological phenomena of other bosonic excitations through thermal Hall probe.

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Presenters

  • Minoru Yamashita

    ISSP, University of Tokyo, Institute for Solid State Physics, University of Tokyo

Authors

  • Minoru Yamashita

    ISSP, University of Tokyo, Institute for Solid State Physics, University of Tokyo

  • Masatoshi Akazawa

    ISSP, University of Tokyo, Institute for Solid State Physics, University of Tokyo

  • Hyun-Yong Lee

    Korea University

  • Hikaru Takeda

    ISSP, University of Tokyo, Institute for Solid State Physics, University of Tokyo

  • Yuri Fujima

    Department of Advanced Materials Science, University of Tokyo

  • Taka-hisa Arima

    Department of Advanced Materials Science, The University of Tokyo, Department of Advanced Materials Science, University of Tokyo, Univ of Tokyo, University of Tokyo, university of tokyo

  • Yusuke Tokunaga

    Univ of Tokyo-Kashiwanoha, Department of Advanced Materials Science, University of Tokyo, University of Tokyo

  • Jung Hoon Han

    Sungkyunkwan University