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000872958 1001_ $$0P:(DE-Juel1)174385$$aZhang, L.-C.$$b0
000872958 245__ $$aMagnonic Weyl states in Cu2OSeO3
000872958 260__ $$aCollege Park, MD$$bAPS$$c2020
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000872958 520__ $$aThe 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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000872958 7001_ $$0P:(DE-HGF)0$$aOnykiienko, Y. A.$$b1
000872958 7001_ $$0P:(DE-HGF)0$$aBuhl, P. M.$$b2
000872958 7001_ $$0P:(DE-HGF)0$$aTymoshenko, Y. V.$$b3
000872958 7001_ $$0P:(DE-Juel1)159141$$aČermák, P.$$b4
000872958 7001_ $$0P:(DE-Juel1)156579$$aSchneidewind, A.$$b5
000872958 7001_ $$0P:(DE-HGF)0$$aStewart, J. R.$$b6
000872958 7001_ $$0P:(DE-HGF)0$$aHenschel, A.$$b7
000872958 7001_ $$0P:(DE-HGF)0$$aSchmidt, M.$$b8
000872958 7001_ $$0P:(DE-Juel1)130548$$aBlügel, S.$$b9
000872958 7001_ $$0P:(DE-HGF)0$$aInosov, D. S.$$b10$$eCorresponding author
000872958 7001_ $$0P:(DE-Juel1)130848$$aMokrousov, Y.$$b11
000872958 773__ $$0PERI:(DE-600)3004165-X$$a10.1103/PhysRevResearch.2.013063$$gVol. 2, no. 1, p. 013063$$n1$$p013063$$tPhysical review research$$v2$$x2643-1564$$y2020
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