Noncollinear Antiferromagnetic Haldane Magnon Insulator

Abstract

In this Letter we present a comprehensive study of topological magnon bands and thermal Hall effect in non-collinear antiferromagnetic systems on the honeycomb lattice with an intrinsic Dzyaloshinskii-Moriya interaction. We theoretically show that the system possesses topological magnon bands with Chern number protected edge modes accompanied by a nonzero thermal magnon Hall effect. These features result from non-collinearity of the magnetic moments due to an applied out-of-plane magnetic field. Our results provide an experimental clue towards the realization of topological magnon transports in honeycomb antiferromagnetic compounds such as XPS${}_3$ (X=Mn,Fe) and $\alpha$-Cu${}_2$V${}_2$O${}_7$.

8 pages, 6 figures; published version

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• Designing Rashba-Dresselhaus effect in magnetic insulators
• Edge states in a two-dimensional honeycomb lattice of massive magnetic skyrmions
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• Topological Aspects of Antiferromagnets
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