Magnon Landau Levels and Spin Responses in Antiferromagnets

Authors

Bo Li, University of Nebraska - LincolnFollow
Alexey Kovalev, University of Nebraska - LincolnFollow

ORCID IDs

Bo Li https://orcid.org/0000-0002-5713-1592

Date of this Version

2020

Citation

Phys. Rev. Lett. 125, 257201 (2020)

DOI:https://doi.org/10.1103/PhysRevLett.125.257201

Comments

© 2020 American Physical Society. Used by permission.

Abstract

We study gauge fields produced by gradients of the Dzyaloshinskii-Moriya interaction and propose a model of an AFM topological insulator of magnons. In the long wavelength limit, the Landau levels induced by the inhomogeneous Dzyaloshinskii-Moriya interaction exhibit relativistic physics described by the Klein-Gordon equation. The spin Nernst response due to the formation of magnonic Landau levels is compared to similar topological responses in skyrmion and vortex-antivortex crystal phases of AFM insulators. Our studies show that AFM insulators exhibit rich physics associated with topological magnon excitations.