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

Shu Zhang, Gyungchoon Go, Kyung Jin Lee, Se Kwon Kim

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


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.

Original languageEnglish
Article number147204
JournalPhysical review letters
Issue number14
Publication statusPublished - 2020 Apr 10

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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