Spin Caloritronics in Noncondensed Bose Gases

TL;DR

This paper investigates spin and heat transport in a noncondensed Bose gas, revealing temperature-dependent transport coefficients, experimental signatures of spin-heat coupling, and anomalous behavior near Bose-Einstein condensation that enhances thermodynamic efficiency.

Contribution

It introduces the study of spin caloritronics in noncondensed Bose gases, highlighting temperature effects and critical region anomalies on transport properties.

Findings

Transport coefficients depend on temperature due to bosonic scattering enhancement.

Experimental signatures include spin accumulation and dissipation.

Transport behavior becomes anomalous near Bose-Einstein condensation, boosting spin-heat conversion efficiency.

Abstract

We consider coupled spin and heat transport in a two-component, atomic Bose gas in the noncon- densed state. We find that the transport coefficients show a temperature dependence reflecting the bosonic enhancement of scattering, and discuss experimental signatures of the spin-heat coupling in spin accumulation and total dissipation. Inside the critical region of Bose-Einstein condensation, we find anomalous behavior of the transport coefficients, and in particular, an enhancement for the spin caloritronics figure of merit that determines the thermodynamic efficiency of spin-heat conversion.