Intrinsic Thermo-Spintronic Response of Superconducting Quasiparticles: Berry Curvature Effects

Abstract: We propose two thermo-spintronic responses of spin-orbit coupled superconductors - the intrinsic thermal Edelstein effect and intrinsic spin Nernst effect - stemming from phase-space and momentum-space Berry curvatures of Bogoliubov quasiparticles. We unveil that the Bloch band spin-orbit coupling and superconducting pairing are entangled in shaping the quasiparticle 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 modulated by tuning the latter. Our work reveals unique Berry curvature properties in topologically trivial superconductors with spin-orbit coupling, and opens a new route to superconducting spintronics.