SKM 2021 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Focus Session: Emerging Phenomena in Superconducting Low Dimensional Hybrid Systems I

TT 6.4: Vortrag

Dienstag, 28. September 2021, 11:30–11:45, H7

A Josephson junction supercurrent diode — •Christian Baumgartner¹, Lorenz Fuchs¹, Andreas Costa¹, Simon Reinhardt¹, Sergei Gronin², Geoffrey Gardner², Tyler Lindemann², Michael Manfra², Paulo Faria Junior¹, Denis Kochan¹, Jaroslav Fabian¹, Nicola Paradiso¹, and Christoph Strunk¹ — ¹University of Regensburg — ²Purdue University

The combination of Rashba spin-orbit interaction and superconductivity leads to the appearance of an anomalous phase shift (ϕ₀) in the current phase relation (CPR) of Josephson junctions, as experimentally demonstrated by several groups in recent years. However, if the CPR is sinusoidal, the ϕ₀ shift does not affect the symmetry between positive and negative branch of the CPR. Here, we demonstrate that in short ballistic Josephson junctions application of an in-plane field perpendicular to the current induces an asymmetry between positive and negative branch of the CPR. Such magnetochiral anisotropy (MCA) is at the basis of the so-called supercurrent diode effect, here shown for the first time in Josephson junctions. We quantify MCA by measuring the kinetic inductance, whose in-plane field dependence allows us to determine the MCA coefficient for the superfluid. The experimental value compares well with the results of tight-binding simulations based on realistic material parameters for epitaxial Al/InAs 2DEGs.