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SKM 2021 – scientific programme

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TT: Fachverband Tiefe Temperaturen

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

TT 6.4: Talk

Tuesday, September 28, 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 Strunk11University 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.

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