Giant conductance oscillations in a normal mesoscopic ring induced by an SNS Josephson current

TL;DR

This paper presents a theoretical model explaining giant conductance oscillations in mesoscopic rings with superconducting contacts, attributing the effect to resonant Andreev level tuning that enhances normal current transparency.

Contribution

It introduces a novel theoretical explanation for conductance oscillations caused by resonant Andreev levels in mesoscopic rings with superconducting mirrors.

Findings

Resonant tuning of Andreev levels enhances conductance.

The effect is demonstrated in a one-dimensional model.

Giant oscillations are linked to increased transparency at resonance.

Abstract

A theoretical explanation of giant conductance oscillations observed in normal mesoscopic rings with superconducting ``mirrors" is proposed. The effect is due to resonant tuning of Andreev levels to the Fermi level, which enhances the transparency of the system to the normal current. The mechanism is demonstrated for a one-dimensional model system.