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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 junctions — Simon Reinhardt1, Tim Ascherl1, Andreas Costa1, Johanna Berger1, Sergei Gronin1, Geoffrey Gardner2, Tyler Lindemann2, Michael Manfra2, Jaroslav Fabian1, Christoph Strunk1, and •Nicola Paradiso1,3 — 1University 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