Field Theory of Mesoscopic Fluctuations in Superconductor/Normal-Metal Systems

TL;DR

This paper develops a field theoretic approach to analyze mesoscopic fluctuations and interference phenomena in superconductor/normal-metal systems, providing insights into their averaged properties and fluctuations.

Contribution

It introduces a novel field theoretic method to study both average behaviors and mesoscopic fluctuations in superconductor/normal-metal systems.

Findings

Analyzed level statistics of SNS-junctions.

Identified new interference phenomena due to mesoscopic coherence.

Provided a framework for studying fluctuations in hybrid superconducting systems.

Abstract

Thermodynamic and transport properties of normal disordered conductors are strongly influenced by the proximity of a superconductor. A cooperation between mesoscopic coherence and Andreev scattering of particles from the superconductor generates new types of interference phenomena. We introduce a field theoretic approach capable of exploring both averaged properties and mesoscopic fluctuations of superconductor/normal-metal systems. As an example the method is applied to the study of the level statistics of a SNS-junction.