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TT: Fachverband Tiefe Temperaturen

TT 40: Topological Josephson Junctions

TT 40.5: Talk

Wednesday, March 18, 2020, 16:00–16:15, HSZ 103

Current–phase relation in a long topological Josephson junction — •Stefan Backens¹ and Alexander Shnirman^1,2 — ¹Institute for Theoretical Condensed Matter Physics (TKM), KIT, Karlsruhe, Germany — ²Institute of Nanotechnology, KIT, Karlsruhe, Germany

The surface of a 3D topological insulator (TI) can be gapped out, e. g., by a proximity-induced superconducting order parameter. We consider a Josephson junction formed by two s-wave superconductors on a TI surface. In this geometry, the surface spectrum comprises electronic modes localised around the junction in addition to scattering modes. Taking into account the contributions of both scattering states and bound states, we analyse the phase dependence of the Josephson current mediated by the TI surface modes. The impact of their spectrum combining spin–orbit coupling and (induced) s-wave superconductivity is of particular interest.