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Thermal Hall effects due to topological spin fluctuations in YMnO3

Author

Listed:
  • Ha-Leem Kim

    (Seoul National University
    Institute for Basic Science)

  • Takuma Saito

    (The University of Tokyo)

  • Heejun Yang

    (Seoul National University
    Institute for Basic Science)

  • Hiroaki Ishizuka

    (Tokyo Institute of Technology)

  • Matthew John Coak

    (Seoul National University
    Institute for Basic Science
    University of Warwick)

  • Jun Han Lee

    (Ulsan National Institute of Science and Technology)

  • Hasung Sim

    (Seoul National University
    Institute for Basic Science)

  • Yoon Seok Oh

    (Ulsan National Institute of Science and Technology)

  • Naoto Nagaosa

    (RIKEN Center for Emergent Matter Science (CEMS), Wako)

  • Je-Geun Park

    (Seoul National University
    Institute for Basic Science
    Seoul National University)

Abstract

The thermal Hall effect in magnetic insulators has been considered a powerful method for examining the topological nature of charge-neutral quasiparticles such as magnons. Yet, unlike the kagome system, the triangular lattice has received less attention for studying the thermal Hall effect because the scalar spin chirality cancels out between adjacent triangles. However, such cancellation cannot be perfect if the triangular lattice is distorted. Here, we report that the trimerized triangular lattice of multiferroic hexagonal manganite YMnO3 produces a highly unusual thermal Hall effect under an applied magnetic field. Our theoretical calculations demonstrate that the thermal Hall conductivity is related to the splitting of the otherwise degenerate two chiralities of its 120˚ magnetic structure. Our result is one of the most unusual cases of topological physics due to this broken Z2 symmetry of the chirality in the supposedly paramagnetic state of YMnO3, due to strong topological spin fluctuations with the additional intricacy of a Dzyaloshinskii-Moriya interaction.

Suggested Citation

  • Ha-Leem Kim & Takuma Saito & Heejun Yang & Hiroaki Ishizuka & Matthew John Coak & Jun Han Lee & Hasung Sim & Yoon Seok Oh & Naoto Nagaosa & Je-Geun Park, 2024. "Thermal Hall effects due to topological spin fluctuations in YMnO3," Nature Communications, Nature, vol. 15(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-023-44448-9
    DOI: 10.1038/s41467-023-44448-9
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    References listed on IDEAS

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    1. Seongsu Lee & A. Pirogov & Misun Kang & Kwang-Hyun Jang & M. Yonemura & T. Kamiyama & S.-W. Cheong & F. Gozzo & Namsoo Shin & H. Kimura & Y. Noda & J.-G. Park, 2008. "Giant magneto-elastic coupling in multiferroic hexagonal manganites," Nature, Nature, vol. 451(7180), pages 805-808, February.
    2. Joosung Oh & Manh Duc Le & Ho-Hyun Nahm & Hasung Sim & Jaehong Jeong & T. G. Perring & Hyungje Woo & Kenji Nakajima & Seiko Ohira-Kawamura & Zahra Yamani & Y. Yoshida & H. Eisaki & S. -W. Cheong & A. , 2016. "Spontaneous decays of magneto-elastic excitations in non-collinear antiferromagnet (Y,Lu)MnO3," Nature Communications, Nature, vol. 7(1), pages 1-6, December.
    3. G. Grissonnanche & A. Legros & S. Badoux & E. Lefrançois & V. Zatko & M. Lizaire & F. Laliberté & A. Gourgout & J.-S. Zhou & S. Pyon & T. Takayama & H. Takagi & S. Ono & N. Doiron-Leyraud & L. Taillef, 2019. "Giant thermal Hall conductivity in the pseudogap phase of cuprate superconductors," Nature, Nature, vol. 571(7765), pages 376-380, July.
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