Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Superconductivity: Poster Session

TT 19.26: Poster

Montag, 7. März 2016, 15:00–18:00, Poster D

Topological surface currents in chiral d-wave superconductors — •Wenbin Rui and Andreas P. Schnyder — Max-Planck-Institut für Festkörperforschung

Motivated by the locally non-centrosymmetric superconductor SrPtAs, the surface states of a multi-band chiral d-wave superconductor are investigated by using a tight-binding model which exhibits two point nodes. These gap closing points realize Weyl nodes that are protected by a nonzero Chern number. The nontrivial topology of this chiral d-wave superconductor manifests itself at the surface in terms of zero-energy arc states that connect the projected Weyl points in the surface Brillouin zone. By self-consistently solving Bogoliubov-de Gennes equations, we determine the spin and orbital character of the surface states. Moreover, we compute the spontaneous spin and charge currents at the surface of the superconductor, which arise due to the nontrivial topology and the strong spin-orbit interaction. We find that the currents are coupled to the chirality of the superconductor and show that they give rise to a small spin polarization at the surface, which could be measured by scanning SQUID microscopy.