Density of states and current-voltage characteristics in SIsFS junctions

TL;DR

This paper investigates the local density of states and current-voltage behavior in complex SIsFS Josephson junctions, revealing how proximity effects and Zeeman splitting influence electronic properties and transition phenomena.

Contribution

It provides new insights into the DOS and I-V characteristics of SIsFS junctions, highlighting the effects of a thin superconducting spacer and ferromagnetic layer on electronic states.

Findings

Presence of significant sub-gap regions with non-zero DOS

Manifestations of 0-$$ transition in DOS behavior

Distinct features in I-V curves linked to electronic states

Abstract

We study the density of states (DOS) inside superconducting Josephson SIsFS junctions with complex interlayer consisting of a thin superconducting spacer 's' between insulator I and a ferromagnetic metal F. The consideration is focused on the local density of states in the vicinity of a tunnel barrier, and it permits to estimate the current-voltage characteristics in the resistive state of such junctions. We study the influence of the proximity effect and Zeeman splitting on the properties of the system, and we find significant sub-gap regions with non-vanishing DOS. We also find manifestations of the 0-$\pi$ transition in the behavior of DOS in a thin s-layer. These properties lead to appearance of new characteristic features on I-V curves which provide additional information about electronic states inside the junction.