Coherent effects in double-barrier Josephson junctions

TL;DR

This paper derives a general solution for ballistic transport in double-barrier Josephson junctions, revealing a phase-coherent regime where supercurrent scales with barrier transparency and analyzing how coherence diminishes with interlayer thickness.

Contribution

It provides the first comprehensive analytical model for ballistic transport in double-barrier Josephson junctions, including phase coherence effects and quasiparticle current calculations.

Findings

Supercurrent is proportional to barrier transparency in the phase-coherent regime.

Coherence is destroyed as interlayer thickness increases.

Quasiparticle dc current is determined at arbitrary voltages.

Abstract

The general solution for ballistic electronic transport through double-barrier Josephson junctions is derived. We show the existence of a regime of phase-coherent transport in which the supercurrent is proportional to the single barrier transparency and the way in which this coherence is destroyed for increasing interlayer thickness. The quasiparticle dc current at arbitrary voltage is determined.