Theory of spin Seebeck effect activated by acoustic chiral phonons

TL;DR

This paper presents a theoretical framework for the spin Seebeck effect driven by chiral phonons in insulator-metal junctions, highlighting a phonon-mediated mechanism independent of magnetism or spin-orbit coupling.

Contribution

It introduces a microscopic theory for the chiral-phonon-activated spin Seebeck effect, deriving a formula for spin current based on acoustic phonon interactions.

Findings

Spin current depends on sample geometry and thermal properties.

The theory explains spin Seebeck effect without magnetic or spin-orbit interactions.

Provides a foundation for phonon-mediated spin transport mechanisms.

Abstract

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.