Acoustic spin transport by superconducting quasiparticles

Funato, Takumi*; Yamakage, Ai*; Matsuo, Mamoru

We theoretically study the generation of spin current due to a surface acoustic wave (SAW) in a superconductor. We model an -wave superconductor as the mean-field Hamiltonian and calculate spin current generated via spin-vorticity coupling based on quantum 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.