Asymmetric Fraunhofer pattern in Josephson junctions from heterodimensional superlattice V$_5$S$_8$

TL;DR

This study investigates Josephson junctions made from the heterodimensional superlattice V$_5$S$_8$, revealing asymmetric Fraunhofer patterns influenced by spin-orbit coupling and magnetic fields, indicating intrinsic current distribution effects.

Contribution

First demonstration of Josephson junctions with V$_5$S$_8$, showing unique asymmetric Fraunhofer patterns due to its special spin-orbit coupling properties.

Findings

Asymmetric Fraunhofer patterns observed in V$_5$S$_8$ JJs

Pattern asymmetry influenced by in-plane magnetic field

Intrinsic nontrivial spatial distribution of Josephson current

Abstract

Introduction of spin-orbit coupling (SOC) in a Josephson junction (JJ) gives rise to unusual Josephson effects. We investigate JJs based on a newly discovered heterodimensional superlattice V$_5$S$_8$ with a special form of SOC. The unique homointerface of our JJs enables elimination of extrinsic effects due to interfaces and disorder. We observe asymmetric Fraunhofer patterns with respect to both the perpendicular magnetic field and the current. The asymmetry is influenced by an in-plane magnetic field. Analysis of the pattern points to a nontrivial spatial distribution of the Josephson current that is intrinsic to the SOC in V$_5$S$_8$.