Supercurrent in the presence of direct transmission and a resonant localized state

TL;DR

This paper investigates the supercurrent behavior in an InSb-Al nanowire Josephson junction under magnetic fields, revealing gate-dependent $\

Contribution

It introduces a theoretical model explaining supercurrent interference involving direct transmission and localized states, matching experimental observations.

Findings

$\

Supercurrent exhibits $\

Gate-dependent asymmetries and $\

Abstract

We study the current-phase relation (CPR) of an InSb-Al nanowire Josephson junction in parallel magnetic fields up to $700$\,mT. At high magnetic fields and in narrow voltage intervals of a gate under the junction, the CPR exhibits $\pi$-shifts. The supercurrent declines within these gate intervals and shows asymmetric gate voltage dependence above and below them. We detect these features sometimes also at zero magnetic field. The observed CPR properties are reproduced by a theoretical model of supercurrent transport via interference between direct transmission and a resonant localized state.