Home > Publications database > Magnonic Weyl states in Cu2OSeO3 > print

001     872958
005     20210401192757.0
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100 1 _ |a Zhang, L.-C.
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245 _ _ |a Magnonic Weyl states in Cu2OSeO3
260 _ _ |a College Park, MD
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520 _ _ |a The multiferroic ferrimagnet Cu2OSeO3 with a chiral crystal structure has attracted a lot of recent attention due to the emergence of a 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 ±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 Dzyaloshinskii-Moriya interaction, crucial for obtaining an accurate fit to the experimental spin-wave spectrum. Also, one additional pair of Weyl points appears near the R point. 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 and number of which can be tuned by modifying the Dzyaloshinskii-Moriya interaction in the system.
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700 1 _ |a Onykiienko, Y. A.
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700 1 _ |a Buhl, P. M.
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700 1 _ |a Tymoshenko, Y. V.
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700 1 _ |a Čermák, P.
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700 1 _ |a Schneidewind, A.
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700 1 _ |a Stewart, J. R.
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700 1 _ |a Henschel, A.
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700 1 _ |a Schmidt, M.
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700 1 _ |a Blügel, S.
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700 1 _ |a Inosov, D. S.
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700 1 _ |a Mokrousov, Y.
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773 _ _ |a 10.1103/PhysRevResearch.2.013063
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