Dresden 2026 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 93: Superconductivity – Poster II
TT 93.20: Poster
Thursday, March 12, 2026, 18:00–20:00, P4
Charge-tunable Cooper-pair diode — •Stefano Trivini1, Jon Ortuzar1, Leonard Edens1, Sebastian Bergeret2,3, and Nacho Pascual1,4 — 1CIC nanoGUNE-BRTA, 20018 Donostia-San Sebastian, Spain — 2Centro de Fisica de Materiales (CFM-MPC) Centro Mixto CSIC-UPV/EHU, E-20018 Donostia-San Sebastian, Spain — 3Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastian, Spain — 4Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
Superconducting diodes, devices that allow Cooper-pair currents to flow more easily in one direction than the other, are set to become key building blocks for dissipationless electronics. Existing realizations, however, rely on magnetic fields, ferromagnets, or complex heterostructures that hinder integration and scalability. Here we demonstrate a diode effect for Cooper-pairs that arises solely from electron-electron interactions in nanoscale superconducting lead islands. When these islands are driven into the Coulomb blockade regime, Cooper-pair transport occurs through resonant charge states. By tuning the island's electrostatic environment, we controllably break particle-hole symmetry and induce nonreciprocal supercurrents, thereby achieving a gate-switchable superconducting diode without any external magnetic field. Our approach enables robust rectification of superconducting currents and microwave photoresponse, providing a scalable strategy to superconducting logic devices.