TY  - JOUR
AU  - Zhang, L.-C.
AU  - Onykiienko, Y. A.
AU  - Buhl, P. M.
AU  - Tymoshenko, Y. V.
AU  - Čermák, P.
AU  - Schneidewind, A.
AU  - Stewart, J. R.
AU  - Henschel, A.
AU  - Schmidt, M.
AU  - Blügel, S.
AU  - Inosov, D. S.
AU  - Mokrousov, Y.
TI  - Magnonic Weyl states in Cu2OSeO3
JO  - Physical review research
VL  - 2
IS  - 1
SN  - 2643-1564
CY  - College Park, MD
PB  - APS
M1  - FZJ-2020-00418
SP  - 013063
PY  - 2020
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000600711800005
DO  - DOI:10.1103/PhysRevResearch.2.013063
UR  - https://juser.fz-juelich.de/record/872958
ER  -