Surface states in superconductors with no inversion symmetry

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Conference Proceeding

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We consider emergence of the surface bound states for superconductors lacking a center of inversion and compute their energy and the density of states. In such superconductors the Fermi surface is split according to helicity (orientation of electron spin with respect to its momentum), and the superconducting gaps differ in the two helicity bands. Energy and spatial structure of the bound states is controlled not only by the shape of the gap in each band, but also by the degree of band mixing due to interface scattering. This leads to a continuous spectrum of subgap states near the interface. We show within a simple model that the suppression of the gap near a pairbreaking interface significantly affects the surface density of states. ©2008 The Physical Society of Japan.

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Journal of the Physical Society of Japan

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