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TT: Fachverband Tiefe Temperaturen

TT 55: Superconductivity: Tunnelling and Josephson Junctions

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 [1]. 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 [2]. In our theoretical work we are studying such hybrid systems in a Josephson junction setup [3]. 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 [4] but also in the superconducting state signatures of such oscillations can be observed as a consequence of spin-splitting in the superconducting TI.

[1] X.-L. Qi and S.-C. Zhang, Rev. Mod. Phys. 83, 1057 (2011)

[2] A. Cook and M. Franz, Phys. Rev. B 84, 201105(R) (2011)

[3] B.D. Josephson, Phys. Lett. 1, 251 (1962)

[[4] J. Ziegler et al., Phys. Rev. B 97, 035157 (2018)