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TT: Fachverband Tiefe Temperaturen
TT 40: Topological Josephson Junctions
TT 40.3: Vortrag
Mittwoch, 18. März 2020, 15:30–15:45, HSZ 103
Transverse Josephson current in magnetic TI junction — •Oleksii Maistrenko1, Benedikt Scharf2, Dirk Manske1, and Ewelina Hankiewicz2 — 1Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany — 2Institut für theoretische Physik (TP4), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
Josephson junctions based on 3D topological insulators offer intriguing possibilities to realize unconventional p-wave pairing and Majorana modes. In particular, such junctions exhibit non-chiral, counterpropagating Majorana modes for a superconducting phase bias φ=π [1]. We show how by applying an appropriately oriented in-plane magnetic field in the junction, we can switch these Majorana modes to a regime in which they become unidirectional. One can understand this switching behavior from the interplay between the magnetic field and the spin-momentum locking of the topological insulator. Interestingly, the application of the in-plane magnetic field is also accompanied by a net transverse supercurrent that can be a sizable fraction of the longitudinal supercurrent. This current might be spin polarized. Magnetic Josephson junctions based on 3D topological insulators thus present a versatile platform for manipulating Majorana modes and controlling transverse supercurrents.
[1] L. Fu and C. L. Kane, Phys. Rev. Lett. 100, 96407 (2008)