Superconductivity-induced macroscopic resonant tunneling

TL;DR

This paper demonstrates that superconductivity can cause a significant increase in conductance in chaotic Josephson junctions due to macroscopic resonant tunneling through many low-energy Andreev levels, supported by analytical and numerical evidence.

Contribution

It introduces the concept of macroscopic resonant tunneling as the mechanism for conductance enhancement in chaotic Josephson junctions, combining analytical and numerical analysis.

Findings

Conductance is enhanced by several orders of magnitude.

The enhancement is due to macroscopic resonant tunneling.

The mechanism involves low-energy quasi-degenerate Andreev levels.

Abstract

We show analytically and by numerical simulations that the conductance through $\pi$-biased chaotic Josephson junctions is enhanced by several orders of magnitude in the short-wavelength regime. We identify the mechanism behind this effect as {\it macroscopic resonant tunneling} through a macroscopic number of low-energy quasi-degenerate Andreev levels.