Cold electron Josephson transistor

TL;DR

This paper presents a mesoscopic Josephson transistor where the supercurrent is controlled via normal current injection, achieving significant modulation of the critical current with high gain and low power consumption.

Contribution

It introduces a novel Josephson transistor utilizing a superconductor-normal metal-superconductor junction with direct electron cooling control, demonstrating large current gain and tunable supercurrent.

Findings

Critical current can be enhanced by more than two times

Supercurrent can be suppressed through bias variation

Device exhibits high current gain (~20) and low power dissipation

Abstract

A superconductor-normal metal-superconductor mesoscopic Josephson junction has been realized in which the critical current is tuned through normal current injection using a symmetric electron cooler directly connected to the weak link. Both enhancement of the critical current by more than a factor of two, and supercurrent suppression have been achieved by varying the cooler bias. Furthermore, this transistor-like device demonstrates large current gain $\sim$20) and low power dissipation.