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강상관계 물질 연구단
강상관계 물질 연구단
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Thermal Hall Effect, Spin Nernst Effect, and Spin Density Induced by a Thermal Gradient in Collinear Ferrimagnets from Magnon−Phonon Interaction

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Title
Thermal Hall Effect, Spin Nernst Effect, and Spin Density Induced by a Thermal Gradient in Collinear Ferrimagnets from Magnon−Phonon Interaction
Author(s)
Sungjoon Park; Naoto Nagaosa; Bohm-Jung Yang
Publication Date
2020-04
Journal
NANO LETTERS, v.20, no.4, pp.2741 - 2746
Publisher
AMER CHEMICAL SOC
Abstract
We theoretically study the intrinsic thermal Hall and spin Nernst effect in collinear ferrimagnets on a honeycomb lattice with broken inversion symmetry. The broken inversion symmetry allows in-plane Dzyaloshinskii−Moriya interaction between the nearest neighbors, which does not affect the linear spin wave theory. However, the Dzyaloshinskii−Moriya interaction induces large Berry curvature in the magnetoelastic excitations through the magnon−phonon interaction (MPI) to produce thermal Hall current. Furthermore, the magnetoelastic excitations transport spin, which is inherited from the magnons. Therefore, spin Nernst current accompanies the thermal Hall current. Because the MPI does not conserve the spin, we examine the spatial distribution of spin induced by a thermal gradient in the system having a stripe geometry. We find that spin is accumulated at the edges, reflecting the spin Nernst current. We also find that the total spin of the systemand, therefore, the magnetizationis changed, because of the thermal gradient and MPI. © 2020 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/7094
ISSN
1530-6984
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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