Proximity Effect and Charging in Mesoscopic Normal Metal - Superconductor Junction Systems

TL;DR

This paper investigates how charging effects influence the proximity effect in mesoscopic normal metal-superconductor junctions, revealing microscopic processes and ground state properties through gate voltage modulation.

Contribution

It introduces the role of charging effects in modulating the proximity effect and ground state characteristics in mesoscopic N-S systems, highlighting electron parity influence.

Findings

Charging suppresses the proximity effect in mesoscopic N-S junctions.

Gate voltages can modulate transport properties related to charging and proximity effects.

Electron parity effects lead to even-odd asymmetry in the proximity effect when the superconductor is isolated.

Abstract

Charging effects in mesoscopic junctions suppress the tunneling of electrons. In normal metal - superconductor systems they also suppress the proximity effect, thereby revealing the nature of the microscopic processes and of the ground state of the system. The effect can be made visible since the charging and proximity effect and hence the transport properties of the system can be modulated by gate voltages. If the superconducting electrode is isolated, electron number parity effect lead to an even-odd asymmetry in the proximity effect.