Surface bound states and spin currents in noncentrosymmetric superconductors.
We investigate the ground state properties of a noncentrosymmetric superconductor near a surface. We determine the spectrum of Andreev bound states due to surface-induced mixing of bands with opposite spin helicities for a Rashba-type spin-orbit coupling. We find that the order parameter suppression qualitatively changes the bound state spectrum. The spin structure of Andreev states leads to a spin supercurrent along the interface, which is strongly enhanced compared to the normal state spin current. Particle and hole coherence amplitudes show Faraday-like rotations of the spin along quasiparticle trajectories.
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA.
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Vorontsov
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Vekhter
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Eschrig