Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Superconductivity: Supercurrent Diode Effect
TT 25.1: Vortrag
Mittwoch, 19. März 2025, 09:30–09:45, H32
Gate Tunable Anomalous Josephson and Supercurrent Diode Effect — •Johanna Berger1, Simon Reinhardt1, Christian Baumgartner1, Lorenz Fuchs1, Tim Ascherl1, Andreas Costa2, Sergei Gronin3, Geoff Gardner3, Tyler Lindemann3, Michael Manfra3, Jaroslav Fabian2, Denis Kochan2,4, Christoph Strunk1, and Nicola Paradiso1 — 1Institut für Experimentelle und Angewandte Physik, University of Regensburg, 93040 Regensburg, Germany — 2Institut für Theoretische Physik, University of Regensburg, 93040 Regensburg, Germany — 3Purdue University, West Lafayette, Indiana 47907 USA — 4Institute of Physics, Slovak Academy of Sciences, 84511 Bratislava, Slovakia
The discovery of the supercurrent diode effect by Ando et al. [1] and its observation in a rich variety of systems caused an increasing interest in the physics of non-reciprocal superconductivity.
Here, we study Josephson junctions in hybrid Al/InGaAs/InAs structures, which harbor strong Rashba spin-orbit interaction. In combination with a Zeeman field, this gives rise to an anomalous phase shift ϕ0 in the current-phase relation (CPR). The presence of high harmonics in the CPR gives rise, in addition, to the supercurrent diode effect [2,3,4]. Using an asymmetric superconducting quantum interferometer we simultaneously measure the ϕ0-shift and supercurrent diode effect on a single junction [5]. By electrostatic gating of the junction, we reveal the link between the ϕ0-shift and supercurrent diode effect.
Keywords: Supercurrent Diode Effect; Anomalous Josephson Effekt; asymmetric SQUID; Rashba spin-orbit interaction; phi0-shift