Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 49: Poster Session: Superconductivity
TT 49.30: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Josephson current switches on topological insulators — •Oleksii Maistrenko1, Benedikt Scharf2, Ewelina Hankiewicz2, and Dirk Manske1 — 1Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany — 2Institut für theoretische Physik (TP4), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
Magnetic Josephson junctions based on triplet-superconductors, such as Sr2 Ru O4, offer promising possibilities for building several types of Josephson current switches [1]. In topological insulator/superconductor heterostructures, triplet pairing correlations are induced in the Dirac surface states, offering a potential alternative to native
triplet-superconductors. Introducing magnetization to the system via an external magnetic field or a nearby ferromagnet changes the spin structure of the anomalous Green’s function and hence the superconducting d-vector. We study how this affects charge and spin transport properties of the Josephson junction. We calculate the current phase relation analytically using the Green’s function technique and numerically with a tight-binding model. Our model addresses both quantum spin Hall edge states as well as surface states of three-dimensional topological insulators.
B. Kastening, D. K. Morr, D. Manske, K. Bennemann, Phys. Rev. Lett. 96, 47009 (2006)