SU(3) Topology of Magnon-Phonon Hybridization in 2D Antiferromagnets

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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.
Publisher
AMER PHYSICAL SOC
Issue Date
2020-04
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW LETTERS, v.124, no.14, pp.147204

ISSN
0031-9007
DOI
10.1103/PhysRevLett.124.147204
URI
http://hdl.handle.net/10203/276706
Appears in Collection
PH-Journal Papers(저널논문)
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