Topological thermal Hall effect due to Weyl magnons

Abstract

We present the first theoretical evidence of zero magnetic field topological (anomalous) thermal Hall effect due to Weyl magnons. Here, we consider Weyl magnons in stacked noncoplanar frustrated kagomé antiferromagnets recently proposed by Owerre, [arXiv:1708.04240]. The Weyl magnons in this system result from macroscopically broken time-reversal symmetry by the scalar spin chirality of noncoplanar chiral spin textures. Most importantly, they come from the lowest excitation, therefore they can be easily observed experimentally at low temperatures due to the population effect. Similar to electronic Weyl nodes close to the Fermi energy, Weyl magnon nodes in the lowest excitation are the most important. Indeed, we show that the topological (anomalous) thermal Hall effect in this system arises from nonvanishing Berry curvature due to Weyl magnon nodes in the lowest excitation, and it depends on their distribution (distance) in momentum space. The present result paves the way to directly probe low excitation Weyl magnons and macroscopically broken time-reversal symmetry in three-dimensional frustrated magnets with the anomalous thermal Hall effect.

9 pages, 4 figures. Revised version. The first proposal of Weyl magnons in this system can be found here arXiv:1708.04240. The present paper proposes the first transport properties induced by Weyl magnons at the lowest excitation

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Cited by in corpus (7)

• Magnon thermal Hall effect in kagome antiferromagnets with Dzyaloshinskii-Moriya interactions
• Thermal Hall effect of magnons in collinear antiferromagnetic insulators: signatures of magnetic and topological phase transitions
• Topological magnetic excitations
• Topological thermal Hall effect driven by fluctuation of spin chirality in frustrated antiferromagnets
• Intrinsic nonlinear thermal Hall transport of magnons: A Quantum kinetic theory approach
• Magnetic vortex liquid and anomalous thermal Hall conductivity in frustrated magnets with bond-dependent interactions
• Photo-induced Floquet Weyl magnons in noncollinear antiferromagnets