Acoustic spin current generation in superconductors

TL;DR

This paper theoretically demonstrates that surface acoustic waves can generate detectable spin currents in superconductors like aluminum, advancing understanding of spin transport in superconducting materials.

Contribution

It introduces a theoretical model showing spin current generation via spin-vorticity coupling in superconductors, a novel approach in the field.

Findings

Spin current can be driven in a single superconductor layer.

Detectable spin currents can be generated in aluminum.

Surface acoustic waves effectively induce spin transport in superconductors.

Abstract

We theoretically study the generation of spin current due to a surface acoustic wave (SAW) in a superconductor. We model an s-wave superconductor as the mean-field Hamiltonian and calculate spin current generated via spin-vorticity coupling based on kinetic theory. The results suggest that the spin current can be driven in a single superconductor layer, and our estimation suggests that the detectable magnitude of the spin current can be generated in aluminum. Our proposal may contribute to the advancement of spin transport in superconductors from application and fundamental physics aspects.