Kavli Affiliate: Mamoru Matsuo
| First 5 Authors: , , , ,
| Summary:
We theoretically explore the generation of spin current driven by a
temperature gradient in a junction between a chiral insulator and a normal
metal. Based on the gyromagnetic response induced by microscopic
acoustic-phonon-mediated lattice rotation, we derive a formula for the spin
current when a finite temperature difference is imposed between two ends of the
sample. We clarify how the phonon-mediated spin current depends on the sample
geometry, the thermal conductivity, the heat conductance at the interface, and
the average temperature. Our formulation provides a microscopic foundation for
the chiral-phonon-activated spin Seebeck effect without relying on magnetism or
spin-orbit interactions.
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