Magnetic-interference patterns in Josephson junctions with d+is symmetry

TL;DR

This paper investigates magnetic interference patterns and spontaneous flux in d+is symmetry Josephson junctions, revealing asymmetries and stability conditions of fractional vortices across various junction lengths.

Contribution

It provides a theoretical analysis of interference patterns and vortex stability in unconventional d+is symmetry Josephson junctions, highlighting effects of junction length and wave component ratios.

Findings

Asymmetry in diffraction patterns persists for lengths up to 10λ_J.

Fractional vortices and antivortices are spontaneously formed and their stability depends on junction parameters.

The study characterizes how d+is symmetry influences magnetic interference in Josephson junctions.

Abstract

The magnetic interference pattern and the spontaneous flux in unconventional Josephson junctions of superconductors with d+is symmetry are calculated for different reduced junction lengths and the relative factor of the d and s wave components. This is a time reversal broken symmetry state. We study the stability of the fractional vortex and antivortex which are spontaneously formed and examine their evolution as we change the length and the relative factor of d and s wave components. The asymmetry in the field modulated diffraction pattern exists for lengths as long as L=10\lambda_J.