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TT 55.9: Vortrag
Donnerstag, 19. März 2020, 12:00–12:15, HSZ 204
Supercurrent in topological insulator nanowire - superconductor Josephson junctions — •Michael Barth, Jacob Fuchs, Cosimo Gorini, and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg
Helical surface states of 3d topological insulator (TI) nanowires are expected to have very promising physical properties like forbidden backscattering . Moreover it is predicted that a topological superconducting state which could possibly host Majorana fermions can be realized by bringing a normal s-wave superconductor in close proximity to a TI . In our theoretical work we are studying such hybrid systems in a Josephson junction setup . We numerically calculate the supercurrent in the system as a function of an applied external magnetic field parallel to the wire axis. Already in the normal state such a magnetic flux leads to Aharonov-Bohm oscillations of the conductance  but also in the superconducting state signatures of such oscillations can be observed as a consequence of spin-splitting in the superconducting TI.
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