Topological Magnon-Phonon Hybrid Excitations in Two-Dimensional Ferromagnets with Tunable Chern Numbers

Gyungchoon Go, Se Kwon Kim, Kyung Jin Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We theoretically investigate magnon-phonon hybrid excitations in two-dimensional ferromagnets. The bulk bands of hybrid excitations, which are referred to as magnon polarons, are analytically shown to be topologically nontrivial, possessing finite Chern numbers. We also show that the Chern numbers of magnon-polaron bands and the number of band-crossing lines can be manipulated by an effective magnetic field. For experiments, we propose to use the thermal Hall conductivity as a probe of the finite Berry curvatures of magnon-polarons. Our results show that a simple ferromagnet on a square lattice supports topologically nontrivial magnon polarons, generalizing topological excitations in conventional magnetic systems.

Original languageEnglish
Article number237207
JournalPhysical review letters
Volume123
Issue number23
DOIs
Publication statusPublished - 2019 Dec 5

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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