Thermal Spin-Accumulation in Electric Conductors and Insulators

TL;DR

This paper introduces a two spin-channel model to explain thermal spin-accumulation caused by heat currents in conductors and insulators, highlighting its potential for long-distance spin transport and detection via the Spin-Nernst effect.

Contribution

It presents a novel theoretical framework for thermal spin-accumulation driven by heat currents in both conductors and insulators, extending understanding of spin-dependent heat transport.

Findings

Thermal spin-accumulation can occur over arbitrarily long distances.

Diffusion equations for thermal spin-accumulation are derived.

Detection via the Spin-Nernst effect is feasible.

Abstract

The interpretation of some recent measurements of spin-dependent voltage for which the electric conduction does not play a role rises some new fundamental questions about the effects of spin-dependent heat currents. A two spin-channel model is proposed in order to describe the effect of out-of-equilibrium spin-dependent heat carriers in electric conductors and insulators. It is shown that thermal spin-accumulation can be generated by the heat currents only over an arbitrarily long distance for both electric conductors or electric insulators. The diffusion equations for thermal spin-accumulation are derived in both cases, and the principle of its detection based on Spin-Nernst effect is described.