Effect of point-contact transparency on coherent mixing of Josephson and transport supercurrents

TL;DR

This paper theoretically investigates how electron reflection at a point contact affects the Josephson effect and vortex-like currents, revealing that low temperatures suppress these currents unless temperature is increased.

Contribution

It introduces a theoretical analysis of how finite transparency influences vortex-like currents in ballistic point contacts with transport current.

Findings

Small reflection destroys vortex-like currents at low temperatures.

Increasing temperature can restore vortex-like current states.

Finite transparency significantly impacts Josephson and transport supercurrents.

Abstract

The influence of electron reflection on dc Josephson effect in a ballistic point contact with transport current in the banks is considered theoretically. The effect of finite transparency on the vortex-like currents near the contact and at the phase difference $\phi =\pi ,$ which has been predicted recently \cite{KOSh}, is investigated. We show that at low temperatures even a small reflection on the contact destroys the mentioned vortex-like current states, which can be restored by increasing of the temperature.