Topological transverse spin transport in a canted antiferromagnet/heavy metal heterostructure
arxiv(2024)
摘要
We theoretically study the conditions under which a spin Nernst effect - a
transverse spin current induced by an applied temperature gradient - can occur
in a canted antiferromagnetic insulator, such as LaFeO_3 and other
materials of the same family. The spin Nernst effect may provide a microscopic
mechanism for an experimentally observed anomalous thermovoltage in LaFeO_3/Pt heterostructures, where spin is transferred across the
insulator/metal interface when a temperature gradient is applied to LaFeO_3 parallel to the interface [W. Lin et al, Nat. Phys. 18, 800 (2022)]. We find that LaFeO_3 exhibits a topological spin
Nernst effect when inversion symmetry is broken on the axes parallel to both
the applied temperature gradient and the direction of spin transport, which can
result in a spin injection across the insulator/metal interface. Our work
provides a general derivation of a symmetry-breaking-induced spin Nernst
effect, which may open a path to engineering a finite spin Nernst effect in
systems where it would otherwise not arise.
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