Computation of current-voltage characteristics of weak links

TL;DR

This paper introduces a simplified model to compute the current-voltage characteristics of weak links in superconducting junctions, emphasizing Andreev reflections as the key dissipative mechanism, applicable across various geometries and conditions.

Contribution

It presents a novel simplified approach for calculating current-voltage characteristics considering Andreev reflections in weak links, applicable to multiple junction types and conditions.

Findings

Computed I-V characteristics of tin microbridges at various temperatures.

Model successfully captures the influence of normal layer thickness and temperature.

Provides a versatile tool for analyzing weak link behaviors in superconducting devices.

Abstract

Simplified model for current-voltage characteristics of weak links is suggested. It is based on approach which considers Andreev reflections as responsible for the dissipative current through the metallic Josephson junction. The model allows to calculate current-voltage characteristics of weak links (superconductor - normal metal - superconductor junctions, microbridges, superconducting nanowires) for different thicknesses of the normal layer at different temperatures. The current-voltage characteristics of tin microbridges at different temperatures were computed.