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TT: Fachverband Tiefe Temperaturen

TT 65: Poster Session Topological Topics

TT 65.25: Poster

Donnerstag, 19. März 2020, 15:00–19:00, P2/EG

0-π transitions in Josephson junctions out of 3D topological insulator nanowires with parallel magnetic field — •Jacob Fuchs, Michael Barth, Raphael Kozlovsky, Cosimo Gorini, and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg, Germany

Josephson junctions out of 3D topological insulators (TIs) are investigated and Andreev bound states and supercurrents are calculated. Upon adding a (orbital) parallel magnetic field, bands with opposite angular momenta are split (similar to a Zeemann field splitting of the spin states). Because the field is also present in the superconducting part of the wire, Andreev reflection is modified. This leads to an energy shift of the Andreev bound states which, in turn, induces interesting 0-π transitions.