Coulomb-enhanced resonance transmission of quantum SINIS junctions

TL;DR

This paper investigates how Coulomb interactions enhance resonance transmission in ballistic SINIS junctions, leading to increased transparency and supercurrent by stabilizing Andreev states against gate voltage variations.

Contribution

It reveals the role of Coulomb effects in maintaining resonance conditions and boosting supercurrent in quantum SINIS junctions, a novel insight into charge transfer mechanisms.

Findings

Coulomb interactions stabilize Andreev states over a broad gate voltage range.

Enhanced junction transparency due to Coulomb effects.

Significant increase in supercurrent compared to non-interacting case.

Abstract

Coherent charge transfer through a ballistic gated SINIS junction is mediated by the resonant tunneling via the Andreev states. Extra charge accommodated on the Andreev levels partially compensates the charge induced by the gate voltage preserving the electron wavelength and maintaining the resonance conditions in a broad range of gate voltages. As a result, the transparency of the junction as well as the supercurrent trough it can be substantially increased as compared to the zero-Coulomb case.