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강상관계 물질 연구단
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Topological magnetoelastic excitations in noncollinear antiferromagnets

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Title
Topological magnetoelastic excitations in noncollinear antiferromagnets
Author(s)
Sungjoon Park; Bohm-Jung Yang
Publication Date
2019-05
Journal
PHYSICAL REVIEW B, v.99, no.17, pp.174435 -
Publisher
AMER PHYSICAL SOC
Abstract
We study the topological property of the magnetoelastic excitation in noncollinear antiferromagnets. As a toy model, we consider the magnon-phonon coupling in a triangular antiferromagnet with a 120 degrees Neel order. We find that in the presence of out-of-plane external magnetic field, the magnon-polaron bands, which arise from hybridization of magnons and phonons, can carry Chern number, even though the individual magnon and phonon bands are topologically trivial. Large Berry curvature is induced from the anticrossing regions between the magnon and phonon bands, which renormalizes the thermal Hall conductivity of phonon bands. To compute the Berry curvature and Chern number of magnon-polarons, we give a simple algorithm to diagonalize magnetoelastic Hamiltonian without diagonalizing the phonon Hamiltonian, by mapping the problem to the diagonalization of bosonic Bogoliubov-de-Gennes (BdG) Hamiltonian. This is necessary because the contribution to the Berry curvature from phonon cannot be properly captured if we compute the Berry curvature from magnetoelastic Hamiltonian whose phonon sector has been already diagonalized. ©2019 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/6530
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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