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TT: Fachverband Tiefe Temperaturen

TT 12: Poster Session Superconductivity

TT 12.34: Poster

Montag, 11. März 2013, 15:00–19:00, Poster D

Signatures of unconventional superconductivity in dI/dV characteristics — •Lars Elster and Ewelina Hankiewicz — Institut für Theoretische Physik, Universität Würzburg, Am Hubland, 97074 Würzburg

We study the dI/dV characteristics of superconductors with different order parameters treating normal state - insulator - superconductor (NIS) junctions within the Bogoliubov-de Gennes (BdG) formalism. The dI/dV characteristics are calculated from the coefficients of Andreev and normal reflections at the interface between normal and superconducting phases treating the insulator as a Dirac-delta like potential barrier. In particular, we find that topological superconductors with broken time-reversal symmetry (BTRS) (e.g. d+is order parameter) show a zero bias peak splitting in the nodal direction, which allows to distinguish them from their non-topological counterparts. Therefore the dI/dV characteristic is a powerful tool in probing the pairing potential of unconventional superconductors, and our predictions can be verified by scanning tunneling microscopy.