Berry Curvature Induced Spin Nernst and Thermal Edelstein Effects in Proximity Superconductors

TL;DR

This paper predicts novel thermo-spintronic effects in proximity superconductors caused by Berry curvatures, which are enhanced at low temperatures and can be tuned, offering new insights into superconducting spintronics.

Contribution

It uncovers how superconducting Berry curvatures influence spin Nernst and Edelstein effects, revealing their entangled nature and temperature dependence in proximity superconductors.

Findings

Enhanced thermo-spintronic responses at low temperatures due to Bogoliubov Fermi surface.

Berry curvatures in topologically trivial superconductors can be significant and tunable.

Proposed methods to probe superconducting Berry curvatures via spintronic effects.

Abstract

We propose two thermo-spintronic responses in proximity induced superconductors with spin-orbit coupled band - spin Nernst effect and thermal Edelstein effect stemming respectively from momentum-space and mixed superconducting Berry curvatures. We unveil that the Bloch band spin-orbit coupling and pairing are entangled in shaping the superconducting Berry curvatures rather than in an additive manner. The resulting thermo-spintronic responses are significantly enhanced at low temperatures by the emergence of Bogoliubov Fermi surface, and can be effectively controlled by tuning the latter. The effects render a probe of Bogoliubov Fermi surface and superconducting Berry curvatures supported by it. Our work reveals Berry curvature properties in topologically trivial proximity superconductors with spin-orbit coupling, and opens a new route to superconducting spintronics.