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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 Paradiso11Institut 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

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