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Magnon-polaron driven thermal Hall effect in a Heisenberg-Kitaev antiferromagnet

N. Li1,*, R. R. Neumann2,*, S. K. Guang1,*, Q. Huang3, J. Liu3, K. Xia1, X. Y. Yue4, Y. Sun4, Y. Y. Wang4 et al.

Q. J. Li5, Y. Jiang5, J. Fang6, Z. Jiang6, X. Zhao7, A. Mook8, J. Henk2, I. Mertig2,†, H. D. Zhou3,‡, and X. F. Sun1,4,§

  • 1Department of Physics, Hefei National Laboratory for Physical Sciences at Microscale, and Key Laboratory of Strongly-Coupled Quantum Matter Physics (CAS), University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
  • 2Institute of Physics, Martin Luther University Halle-Wittenberg, Halle (Saale) D-06120, Germany
  • 3Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA
  • 4Institute of Physical Science and Information Technology, Anhui University, Hefei, Anhui 230601, People's Republic of China
  • 5School of Physics and Optoelectronics, Anhui University, Hefei, Anhui 230601, People's Republic of China
  • 6School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
  • 7School of Physical Sciences, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
  • 8Institute of Physics, Johannes Gutenberg University, Mainz D-55128, Germany

  • *These authors contributed equally to this work.
  • †ingrid.mertig@physik.uni-halle.de
  • ‡hzhou10@utk.edu
  • §xfsun@ahu.edu.cn

Phys. Rev. B 108, L140402 – Published 4 October, 2023

DOI: https://doi.org/10.1103/PhysRevB.108.L140402

Abstract

We investigate the thermal Hall effect in the Heisenberg-Kitaev antiferromagnet Na2Co2TeO6, where we observe negative thermal Hall conductivity (THC) with thermal Hall angles up to 2% at low magnetic fields, which changes the sign to positive THC at higher fields. Our theoretical calculations, incorporating spin-lattice coupling, reveal that the quantum-geometric Berry curvature of magnon polarons counteracts the purely magnonic contribution, resulting in a reversed sign and an increased magnitude in THC. This finding emphasizes the significance of spin-lattice coupling in understanding the thermal Hall effect.

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