Spin-orbit coupling and linear crossings of dipolar magnons in van der Waals antiferromagnets
J. Liu (Beijing Normal University)
L. Wang (Kavli institute of nanoscience Delft, TU Delft - QN/Akhmerov Group)
Ka Shen (Beijing Normal University)
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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.