Thermal Hall Effect Induced by Magnon-Phonon Interactions

Xiaoou Zhang, Yinhan Zhang, Satoshi Okamoto, and Di Xiao
Phys. Rev. Lett. 123, 167202 – Published 15 October 2019
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Abstract

We propose a new mechanism for the thermal Hall effect in exchange spin-wave systems, which is induced by the magnon-phonon interaction. Using symmetry arguments, we first show that this effect is quite general, and exists whenever the mirror symmetry in the direction of the magnetization is broken. We then demonstrate our result in a collinear ferromagnet on a square lattice, with perpendicular easy-axis anisotropy and Dzyaloshinskii-Moriya interaction from mirror symmetry breaking. We show that the thermal Hall conductivity is controlled by the resonant contribution from the anticrossing points between the magnon and phonon branches, and estimate its size to be comparable to that of the magnon-mediated thermal Hall effect.

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  • Received 18 March 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.167202

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Xiaoou Zhang1, Yinhan Zhang1, Satoshi Okamoto2, and Di Xiao1

  • 1Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
  • 2Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

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Issue

Vol. 123, Iss. 16 — 18 October 2019

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