Andreev spectra and subgap bound states in multiband superconductors

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

Research output: Contribution to journalArticleAcademicpeer-review

80 Citations (Scopus)
109 Downloads (Pure)


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
Issue number7
Publication statusPublished - 2009


  • IR-73636
  • METIS-259187

Cite this