Soliton induced critical current oscillations in two-band superconducting bridges

TL;DR

This paper demonstrates that in two-band superconducting bridges, the critical current density exhibits oscillations with the bridge length due to phase solitons, which vanish under strong interband coupling.

Contribution

It introduces a theoretical analysis of critical current oscillations caused by phase solitons in two-band superconductors using time-dependent Ginzburg-Landau theory.

Findings

Critical current oscillates with bridge length due to phase solitons.

Oscillations disappear with strong interband coupling.

Phase solitons change in number as length varies.

Abstract

Using time-dependent Ginzburg-Landau theory we find oscillations of critical current density $j_c$ as a function of the length $L$ of the bridge formed from two-band superconductor. We explain this effect by appearance of the phase solitons in the bridge at $j<j_c$, those number changes with change of $L$. In case of sufficiently strong interband coupling oscillations of $j_c$ disappear.