Josephson Field-Effect Transistors Based on All-Metallic Al/Cu/Al Proximity Nanojunctions

We demonstrate proximity-based all-metallic mesoscopic superconductor-normal metal-superconductor (SNS) field-effect controlled Josephson transistors (SNS-FETs) and show their full characterization from the critical temperature Tc down to 50 mK in the presence of both electric and magnetic fields. The ability of a static electric field—applied by means of a lateral gate electrode—to suppress the critical current Is in a proximity-induced...