Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 32: Transport: Topological Insulators 2 (jointly with DS, HL, MA, O)

TT 32.9: Talk

Tuesday, March 17, 2015, 12:00–12:15, H 3005

Superconducting proximity effect in three-dimensional topological insulators in the presence of external magnetic fields — •Pablo Burset, Grigory Tkachov, Ewelina Hankiewicz, and Björn Trauzettel — Institute for Theoretical Physics and Astrophysics, University of Würzburg, D-97074 Würzburg, Germany

The proximity induced pair potential in a topological insulator-superconductor hybrid features an interesting superposition of conventional spin-singlet potential from the superconductor and spin-triplet pairing induced by the surface state of the topological insulator. We theoretically describe ballistic junctions between superconductors and topological insulators under external magnetic fields. We use Green functions techniques to calculate experimentally relevant transport signatures like normal-superconductor tunnel spectroscopy, local density of states, and Josephson current. Additionally, we consider the effect of both topological order and an external magnetic field in the superconducting correlations. We associate the unconventional transport signatures with the symmetry of the singlet and triplet components of the pair potential.