Dresden 2026 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 73: Superconductivity: Tunneling and Josephson Junctions
TT 73.5: Vortrag
Donnerstag, 12. März 2026, 10:30–10:45, CHE/0089
Microwave mediated Cooper pair currents in single and double Josephson junctions — •Stefano Trivini1, Leonard Edens1, Jon Ortuzar2, and Jose Ignacio Pascual1,3 — 1CIC nanoGUNE-BRTA, San Sebastian, Spain — 2Quantronics group SPEC, CEA-Saclay — 3Ikerbasque, Basque Foundation for Science, Bilbao, Spain
Tunnelling of Cooper pairs in STM Josephson junctions (JJs) is usually described as an incoherent process mediated by the junction's electromagnetic environment. Under microwave irradiation, photons can assist the tunnelling of quasiparticles as captured by the Tien-Gordon theory. For a current-biased, phase-coherent junction, Shapiro steps at voltages multiple of hv/2e are expected. Here, we study Pb-Pb single JJs realized in bulk Pb and in double JJs systems, formed by small Pb islands, under microwave irradiation. The microwave power maps depend on the tip-sample distance and can be described either by the TG approach or the RCSJ model. In double JJs, we observe asymmetric microwave maps whose shape reflects Coulomb-blockade processes on the Pb island.
Keywords: superconductivity; radiofrequency; coulomb blockade; scanning tunneling microscopy; josephson junction