Can mesoscopic fluctuations reverse the supercurrent through a disordered Josephson junction?

Abstract

We calculate the Josephson coupling energy $U_J(\varphi )$ (related to the supercurrent $I=(2e/\hslash )d{U}_J/d\varphi$) for a disordered normal metal between two superconductors with a phase difference $\varphi$. We demonstrate that the symmetry of the scattering matrix of non-interacting quasiparticles in zero magnetic field implies that $U_J(\varphi )$ has a minimum at $\varphi =0$. A maximum (that would lead to a $\pi$-junction or negative superfluid density) is excluded for any realization of the disorder.

2 pages

References in corpus (3)

• Quantum suppression of superconductivity in ultrathin nanowires
• Anomalous temperature dependence of the supercurrent through a chaotic Josephson junction
• A novel superconducting glass state in disordered thin films in Clogston limit

Cited by in corpus (5)

• Mesoscopic fluctuations of the supercurrent in diffusive Josephson junctions
• $\pi$-junction qubit in monolayer graphene
• Nonlinearity of transparent SNS weak links decreases sharply with length
• Andreev spin relaxation time in a shadow-evaporated InAs weak link
• Negative critical currents in single-channel Josephson junctions