%0 Journal Article
%A Zhang, L.-C.
%A Onykiienko, Y. A.
%A Buhl, P. M.
%A Tymoshenko, Y. V.
%A Čermák, P.
%A Schneidewind, A.
%A Stewart, J. R.
%A Henschel, A.
%A Schmidt, M.
%A Blügel, S.
%A Inosov, D. S.
%A Mokrousov, Y.
%T Magnonic Weyl states in Cu2OSeO3
%J Physical review research
%V 2
%N 1
%@ 2643-1564
%C College Park, MD
%I APS
%M FZJ-2020-00418
%P 013063
%D 2020
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000600711800005
%R 10.1103/PhysRevResearch.2.013063
%U https://juser.fz-juelich.de/record/872958