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PRV: Preisträgervorträge

PRV III

PRV III: Preisträgervortrag

Donnerstag, 21. März 2024, 13:15–13:45, H 0105

Superconducting diode effect, magnetochiral anisotropy and other nonreciprocal effects in ϕ0 Josephson junctionsSimon Reinhardt1, Tim Ascherl1, Andreas Costa1, Johanna Berger1, Sergei Gronin1, Geoffrey Gardner2, Tyler Lindemann2, Michael Manfra2, Jaroslav Fabian1, Christoph Strunk1, and •Nicola Paradiso1,31University of Regensburg — 2Purdue University — 3Laureate of the Walter-Schottky-Prize 2024

The simultaneous breaking of spatial inversion and time-reversal symmetry enables the observation of two fascinating phenomena in homogeneous Josephson junctions: the anomalous ϕ0-shift and the supercurrent diode effect. Here, we report about experiments demonstrating the origin and the link between the two effects. Our main platform is a 2D electron gas in InGaAs/InAs/InGaAs, where superconductivity is induced by proximity with an epitaxial Al layer. In single Josephson junctions, an in-plane field perpendicular to the current induces a magnetochiral anisotropy for the inductance [1], whose sign changes at the onset of a 0-π-like transition [2] for the Andreev bound states. In 2D arrays of multiterminal junctions, the ϕ0-shift breaks the symmetry of the pinning potential, giving rise to nonreciprocal vortex dynamics. Finally, SQUID experiments [3] with gated junctions reveal the connection between anomalous ϕ0-shift, higher harmonics in the current-phase relation and diode effect.

[1] C. Baumgartner et al., Nat. Nano. 17, 39-44 (2021).

[2] A. Costa et al., Nat. Nano. 18-1266-1272 (2023).

[3] S. Reinhardt et al. arXiv:2308.01061 (2023).

Keywords: Supercurrent diode effect; Josephson junctions; Rashba; InAs; anomalous Josephson effect

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