Link between supercurrent diode and anomalous Josephson effect revealed by gate-controlled interferometry

Abstract

In Josephson diodes the asymmetry between positive and negative current branch of the current-phase relation leads to a polarity-dependent critical current and Josephson inductance. The supercurrent nonreciprocity can be described as a consequence of the anomalous Josephson effect -- a ${\phi }_0$-shift of the current-phase relation -- in multichannel ballistic junctions with strong spin-orbit interaction. In this work, we simultaneously investigate ${\phi }_0$-shift and supercurrent diode efficiency on the same Josephson junction by means of a superconducting quantum interferometer. By electrostatic gating, we reveal a direct link between ${\phi }_0$-shift and diode effect. Our findings show that the supercurrent diode effect mainly results from magnetochiral anisotropy induced by spin-orbit interaction in combination with a Zeeman field.

arXiv comment15 pages, 8 figures

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• Evidence of $\varphi$0-Josephson junction from skewed diffraction patterns in Sn-InSb nanowires
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