Spin-orbit coupling and linear crossings of dipolar magnons in van der Waals antiferromagnets

Journal article (2020)

Authors

J. Liu Beijing Normal University
L. Wang QN/Akhmerov Group - AS , Kavli institute of nanoscience Delft
Ka Shen Beijing Normal University
Research Group
QN/Akhmerov Group (AS) (TU Delft)
Copyright: © 2020 J. Liu, L. Wang, Ka Shen
DOI
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https://doi.org/10.1103/PhysRevB.102.144416
More Info
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Published Date

2020

Language

English

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Akhmerov Group

Abstract

A magnon spin-orbit coupling, induced by the dipole-dipole interaction, is derived in monoclinic-stacked bilayer honeycomb spin lattice with perpendicular magnetic anisotropy and antiferromagnetic interlayer coupling. Linear crossings are predicted in the magnon spectrum around the band minimum in Γ valley, as well as in the high-frequency range around the zone boundary. The linear crossings in K and K′ valleys, which connect the acoustic and optical bands, can be gapped when the intralayer dipole-dipole or Kitaev interactions exceed the interlayer dipole-dipole interaction, resulting in a phase transition from semimetal to insulator. Our results are useful for analyzing the magnon spin dynamics and transport properties in van der Waals antiferromagnets.