| We consider the structure of the surface states at the pairbreaking boundaries of non-centrosymmetric superconductors. In the region of the order parameter suppression multiple Andreev reflections significantly modify the energy and the intragap density of states due to bound states. We elucidate the physics behind this modification by considering a simple model of gap suppression, and comparing it with a fully self- consistent microscopic calculation. We emphasize the experimentally relevant consequences of the lack of inversion symmetry for the surface states. As the discontinuity in the spin-orbit coupling at the boundary makes the interface spin-active, we analyse the resulting spin structure of the bound states, and discuss their modification for magnetic interfaces. |
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