Magnonic Weyl states in Cu2OSeO3

Abstract

The multiferroic ferrimagnet Cu${}_2$OSeO${}_3$ with a chiral crystal structure attracted a lot of recent attention due to the emergence of magnetic skyrmion order in this material. Here, the topological properties of its magnon excitations are systematically investigated by linear spin-wave theory and inelastic neutron scattering. When considering Heisenberg exchange interactions only, two degenerate Weyl magnon nodes with topological charges $\pm$2 are observed at high-symmetry points. Each Weyl point splits into two as the symmetry of the system is further reduced by including into consideration the nearest-neighbor Dzyaloshinsky-Moriya interaction, crucial for obtaining an accurate fit to the experimental spin-wave spectrum. The predicted topological properties are verified by surface state and Chern number analysis. Additionally, we predict that a measurable thermal Hall conductivity can be associated with the emergence of the Weyl points, the position of which can be tuned by changing the crystal symmetry of the material.

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• Topological Magnons: A Review
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• Interaction-stabilized topological magnon insulator in ferromagnets
• Topological magnon band structure of emergent Landau levels in a skyrmion lattice
• Intrinsic spin Nernst effect of magnons in a noncollinear antiferromagnet
• Topological Phases in Magnonics
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• Dirac magnons, nodal lines, and nodal plane in elemental gadolinium
• Magnetic hexamers interacting in layers in the (Na,K)${}_2$Cu${}_3$O(SO${}_4{)}_3$ minerals
• Recent Advances in Unconventional Ferroelectrics and Multiferroics
• Low energy magnons in the chiral ferrimagnet ${\text{Cu}}_2{\text{OSeO}}_3$: a coarse-grained approach
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• Phonon topology and winding of spectral weight in graphite
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