Dresden 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...
TT 40.5: Vortrag
Mittwoch, 18. März 2020, 16:00–16:15, HSZ 103
Current–phase relation in a long topological Josephson junction — •Stefan Backens1 and Alexander Shnirman1,2 — 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.