SU(3) Topology of Magnon-Phonon Hybridization in 2D Antiferromagnets
- Authors
- Zhang, Shu; Go, Gyungchoon; Lee, Kyung-Jin; Kim, Se Kwon
- Issue Date
- 9-4월-2020
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW LETTERS, v.124, no.14
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW LETTERS
- Volume
- 124
- Number
- 14
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/56634
- DOI
- 10.1103/PhysRevLett.124.147204
- ISSN
- 0031-9007
- Abstract
- Magnon-phonon hybrid excitations are studied theoretically in a two-dimensional antiferromagnet with an easy axis normal to the plane. We show that two magnon bands and one phonon band are intertwined by the magnetoelastic coupling through a nontrivial SU(3) topology, which can be intuitively perceived by identifying a skyrmion structure in the momentum space. Our results are insensitive to lattice details and generally applicable to two-dimensional antiferromagnets. We show this by developing a continuum theory as the long-wavelength approximation to the tight-binding model. The theoretical results can be probed by measuring the thermal Hall conductance as a function of the temperature and the magnetic field. We envision that the magnetoelastic coupling in antiferromagnets can be a promising venue in search of various topological excitations, which cannot be found in magnetic or elastic models alone.
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