Topological Spin Excitations in Honeycomb Ferromagnet CrI3
- Authors
- Chen, Lebing; Chung, Jae-Ho; Gao, Bin; Chen, Tong; Stone, Matthew B.; Kolesnikov, Alexander, I; Huang, Qingzhen; Dai, Pengcheng
- Issue Date
- 14-11월-2018
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW X, v.8, no.4
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW X
- Volume
- 8
- Number
- 4
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/71845
- DOI
- 10.1103/PhysRevX.8.041028
- ISSN
- 2160-3308
- Abstract
- In two-dimensional honeycomb ferromagnets, bosonic magnon quasiparticles (spin waves) may either behave as massless Dirac fermions or form topologically protected edge states. The key ingredient defining their nature is the next-nearest-neighbor Dzyaloshinskii-Moriya interaction that breaks the inversion symmetry of the lattice and discriminates chirality of the associated spin-wave excitations. Using inelastic neutron scattering, we find that spin waves of the insulating honeycomb ferromagnet CrI3 (T-C = 61 K) have two distinctive bands of ferromagnetic excitations separated by a similar to 4 meV gap at the Dirac points. These results can only be understood by considering a Heisenberg Hamiltonian with DzyaloshinskiiMoriya interaction, thus providing experimental evidence that spin waves in CrI3 can have robust topological properties potentially useful for dissipationless spintronic applications.
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