Magnonic Weyl states in Cu2OSeO3
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
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. EachWeyl 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.
Details
Original language | English |
---|---|
Article number | 013063 |
Number of pages | 9 |
Journal | Physical Review Research |
Volume | 2 |
Issue number | 1 |
Publication status | Published - 21 Jan 2020 |
Peer-reviewed | Yes |
External IDs
Scopus | 85084919569 |
---|