d-vector precession induced pumping in topological p-wave superconductors

Jun-Jie Fu; Jin An

doi:10.1103/dgkg-t9h9

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d-vector precession induced pumping in topological p-wave superconductors

Jun-Jie Fu, Jin An

DOI 10.1103/dgkg-t9h9 · Physical Review B

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Abstract

Time-reversal-invariant p-wave superconductors (SCs) are characterized by their d vectors, whose orientations could be manipulated by a tiny magnetic field. We study in this paper the adiabatic pumping process induced by periodically rotating the d vector in a topological p-wave SC, which is coupled to two normal leads. If the d vector rotates nearly within a plane, the pumped spin 2Sz/ℏ over one cycle is nearly quantized at 2 without net charge pumping. When the pumping lead is fully spin polarized, both the pumped charge Q/e and spin 2Sz/ℏ will peak nearly at 1. When a mixing s-wave pairing component is taken into account, a topological phase transition can be driven by modulating the ratio between the pairing components. We find a sharp resonance phenomenon near the phase transition when the p-wave d vector is adiabatically rotating, which may help experimentally distinguish the topological SCs from trivial ones.