Andreev spectra and subgap bound states in multiband superconductors

Alexandre Avraamovitch Golubov, Alexander Brinkman, Yukio Tanaka, I.I. Mazin, O.V. Dolgov

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Abstract

A theory of Andreev conductance is formulated for junctions involving normal metals (N) and multiband superconductors (S) and applied to the case of superconductors with nodeless extended s±-wave order parameter symmetry, as possibly realized in the recently discovered ferropnictides. We find qualitative differences from tunneling into s-wave or d-wave superconductors that may help to identify such a state. First, interband interference leads to a suppression of Andreev reflection in the case of a highly transparent N/S interface and to a current deficit in the tunneling regime. Second, surface bound states may appear, both at zero and at nonzero energies.
Original languageUndefined
Pages (from-to)077003-
JournalPhysical review letters
Volume103
Issue number7
DOIs
Publication statusPublished - 2009

Keywords

  • IR-73636
  • METIS-259187

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