Ultra-low dissipation Josephson transistor

TL;DR

This paper introduces an SNS Josephson transistor that uses superconducting microcoolers to control supercurrent with extremely low power dissipation, promising for advanced electronic applications.

Contribution

It presents a novel 4-terminal SNS Josephson transistor leveraging microcoolers to modulate supercurrent with minimal energy loss.

Findings

Large supercurrent enhancements achieved via electron cooling.

Device exhibits extremely low power dissipation.

Control voltage effectively modulates Josephson current.

Abstract

A superconductor-normal metal-superconductor (SNS) transistor based on superconducting microcoolers is presented. The proposed 4-terminal device consists of a long SNS Josephson junction whose N region is in addition symmetrically connected to superconducting reservoirs through tunnel barriers (I). Biasing the SINIS line allows to modify the quasiparticle temperature in the weak link, thus controlling the Josephson current. We show that, in suitable voltage and temperature regimes, large supercurrent enhancements can be achieved with respect to equilibrium, due to electron ``cooling'' generated by the control voltage. The extremely low power dissipation intrinsic to the structure makes this device relevant for a number of electronic applications.