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Thermal Hall effect, spin Nernst effect, and spin density induced by thermal gradient in collinear ferrimagnets from magnon-phonon interaction | | Sungjoon Park
; Naoto Nagaosa
; Bohm-Jung Yang
; | | Date: |
16 Oct 2019 | | Abstract: | We theoretically study the thermal Hall conductivity and spin Nernst effect
in collinear ferrimagnets on a honeycomb lattice with broken inversion symmetry
between the nearest neighbors. The broken inversion symmetry allows in-plane
Dzyaloshinskii-Moriya interaction between the nearest neighbors, which does not
affect the magnon spectrum in the linear spin wave theory. However, the
Dzyaloshinskii-Moriya interaction can induce large Berry curvature in the
magnetoelastic excitation spectrum through the magnon-phonon interaction to
produce thermal Hall current. Furthermore, we find that the magnetoelastic
excitations transport spin, which is inherited from the magnon bands.
Therefore, the thermal Hall current is accompanied by spin Nernst current.
Because the magnon-phonon interaction does not conserve the spin, we also
compute the spin accumulation using the Kubo formula. Surprisingly, the spin
Nernst current does not cause any asymmetric spin accumulation near the
boundary when we introduce edges to the system because of the spin
non-conservation. However, we find the magnon-phonon interaction can induce
non-vanishing total spin expectation value in the system with a stripe geometry
having armchair edges. | | Source: | arXiv, 1910.7206 | | Services: | Forum | Review | PDF | Favorites | |
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