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Golubov AA, Brinkman A, Tanaka Y, et al. Andreev spectra and subgap bound states in multiband superconductors. Phys Rev Lett. 2009;103(7):077003doi: 10.1103/PhysRevLett.103.077003.
Golubov, A. A., Brinkman, A., Tanaka, Y., Mazin, I. I., & Dolgov, O. V. (2009). Andreev spectra and subgap bound states in multiband superconductors. Physical review letters, 103(7), 077003. https://doi.org/10.1103/PhysRevLett.103.077003
Golubov, A A, et al. "Andreev spectra and subgap bound states in multiband superconductors." Physical review letters vol. 103,7 (2009): 077003. doi: https://doi.org/10.1103/PhysRevLett.103.077003
Golubov AA, Brinkman A, Tanaka Y, Mazin II, Dolgov OV. Andreev spectra and subgap bound states in multiband superconductors. Phys Rev Lett. 2009 Aug 14;103(7):077003. doi: 10.1103/PhysRevLett.103.077003. Epub 2009 Aug 12. PMID: 19792677.
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Phys Rev Lett. 2009 Aug 14;103(7):077003. doi: 10.1103/PhysRevLett.103.077003. Epub 2009 Aug 12.

Andreev spectra and subgap bound states in multiband superconductors.

Physical review letters

A A Golubov, A Brinkman, Yukio Tanaka, I I Mazin, O V Dolgov

Affiliations

  1. MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands.

PMID: 19792677 DOI: 10.1103/PhysRevLett.103.077003

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.

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