Kavli Affiliate: Mamoru Matsuo
| First 5 Authors: Naoki Nishimura, Takumi Funato, Mamoru Matsuo, Takeo Kato,
| 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 effect caused by microscopic rotation due to
phonons, we derive a formula for a spin current when a finite temperature
difference is imposed at two ends of the sample. We clarify how the 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 and spin-orbit interactions.
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