Thermal Hall Effect Induced by Magnon-Phonon Interactions

Xiaoou Zhang; Yinhan Zhang; Satoshi Okamoto; Di Xiao

doi:10.1103/PhysRevLett.123.167202

Thermal Hall Effect Induced by Magnon-Phonon Interactions

Xiaoou Zhang, Yinhan Zhang, Satoshi Okamoto, Di Xiao

Materials Theory

Research output: Contribution to journal › Article › peer-review

94 Scopus citations

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.

Original language	English
Article number	167202
Journal	Physical Review Letters
Volume	123
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.123.167202
State	Published - Oct 15 2019

Funding

We acknowledge useful discussions with Ran Cheng, Matthew W. Daniels, Tao Qin, and Junren Shi. Work at CMU is supported by the U.S. Department of Energy, Basic Energy Science, Pro-QM EFRC No. DE-SC0019443 (X. Z.) and No. DE-SC0012509 (Y. Z. and D. X.). S. O. acknowledges support by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences, and Engineering Division. D. X. also acknowledges support from a Research Corporation for Science Advancement Cottrell Scholar Grant.

Funders	Funder number
U.S. Department of Energy
Carnegie Mellon University
Division of Materials Sciences and Engineering
Basic Energy Sciences
Office of Science
Basic Energy Sciences	DE-SC0019443, DE-SC0012509

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10.1103/PhysRevLett.123.167202

Cite this

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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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Thermal Hall Effect Induced by Magnon-Phonon Interactions

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