Controllable critical Josephson current and 0-{\pi} transition in superconductor-insulator-superconductor heterostructures

TL;DR

This paper explores how external Zeeman fields and supercurrents can control the Josephson current and 0-π transition in superconductor-insulator-superconductor heterostructures, enabling potential advancements in superconducting electronics.

Contribution

It demonstrates the controllability of Josephson current via magnetic fields and supercurrents, highlighting a new mechanism for tuning superconducting junctions.

Findings

Critical Josephson current depends on Zeeman field orientation.

Superconductivity can be stabilized in high magnetic fields.

Control over 0-π transition enables novel device functionalities.

Abstract

We investigate Josephson junctions among conventional superconducting wires, in the presence of externally applied Zeeman fields and supercurrents. We demonstrate that the critical Josephson current and the current-phase relation of the junction depends on the relative orientation of the applied Zeeman fields and supercurrents. The controllability of the Josephson current relies on the stabilization of conventional superconductivity in high magnetic fields, due to the restoration of the opposite momentum opposite spin projection resonance at the Fermi level. We assert that our results can lead to the development of novel superconducting electronics.