Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 73: Superconductivity: Tunneling and Josephson Junctions
TT 73.1: Talk
Thursday, March 12, 2026, 09:30–09:45, CHE/0089
Transparency-controlled multiple charge transfer in superconducting tunnel junctions at atomic scale — •Jiasen Niu1,2,3, Yudai Sato1,2,3, Maialen Larrazabal4, Jian-feng Ge5, and Milan Allan1,2,3 — 1Leiden Institute of Physics, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands — 2Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstrasse 4, München 80799, Germany — 3Munich Center for Quantum Science and Technology (MCQST), München, Germany — 4Debye Institute of Nanomaterials Science, Utrecht University, PO Box 80000, 3508 TA Utrecht, The Netherlands — 5Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
Charge transport in superconducting junctions enable multi-charge transfer and can be identified through shot noise. Using shot noise STM with a newly developed amplifier, we measured Pb(111) junctions with tunable transparency. At low transparency, the effective charge is strongly suppressed (q < ne), while increasing transparency enhances AR/MAR, driving q toward 2e in SIN junctions and ne in SIS junctions. The measurements agree quantitatively with single-channel simulations. Our results track the continuous evolution from multi-electron to single-electron transport and demonstrate transparency as a key parameter in controlling superconducting quantum transport.
Keywords: shot noise; mulitple Andreev reflection; mulitple charge transfer; noise-STM; transparency