Researchers from SQEL have just realized field-effect controlled Josephson transistors based on proximity all-metallic mesoscopic superconductor-normal metal-superconductor junctions.

The research, published on ACS Nano by G. De Simoni and co-authors, suggests that the mechanism at the basis of the superconducting field-effect is quite general and does not rely on the existence of a true pairing potential, but rather the presence of superconducting correlations is enough for the effect to occur.

On the technological side, our findings widen the family of materials available for the implementation of all-metallic field-effect transistors to synthetic proximity-induced superconductors.