Current-voltage characteristics of asymmetric double-barrier Josephson junctions

Abstract

We develop a theory for the current-voltage characteristics of diffusive superconductor-normal metal-superconductor Josephson junctions with resistive interfaces and the distance between the electrodes smaller than the superconducting coherence length. The theory allows for a quantitative analytical and numerical analysis in the whole range of the interface transparencies and asymmetry. We focus on the regime of large interface resistance compared to the resistance of the normal region, when the electron-hole dephasing in the normal region is significant and the finite length of the junction plays a role. In the limit of strong asymmetry we find pronounced current structures at the combination subharmonics of $\Delta +{\Delta }_g$, where ${\Delta }_g$ is the proximity minigap in the normal region, in addition to the subharmonics of the energy gap $2\Delta$ in the electrodes. In the limit of rather transparent interfaces, our theory recovers a known formula for the current in a short mesoscopic connector - a convolution of the current through a single-channel point contact with the transparency distribution for an asymmetric double-barrier potential.

10 pages, 3 figures

References in corpus (5)

• Tunable Supercurrent Through Semiconductor Nanowires
• Supercurrent and multiple Andreev reflections in an InSb nanowire Josephson junction
• Andreev reflection versus Coulomb blockade in hybrid semiconductor nanowire devices
• Quantized conductance and its correlation to the supercurrent in a nanowire connected to superconductors
• Dissipative charge transport in diffusive superconducting double-barrier junctions

Cited by in corpus (2)

• Resonant subgap current transport in Josephson field effect transistor
• Tunable pseudogaps due to non-local coherent transport in voltage-biased three-terminal Josephson junctions