Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 19: Poster Monday: Scanning Probe Techniques 1

O 19.9: Poster

Montag, 5. September 2022, 18:00–20:00, P4

Shot-noise measurements of single-atom Josephson junctions — •Verena Caspari, Idan Tamir, Christian Lotze, and Katharina J. Franke — Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany

Current passing through small constrictions fluctuates due to the discreteness of charge. Measuring this so-called shot noise in atomic-scale superconducting junctions can provide valuable information, from the quanta of charge transferred in multiple Andreev reflections to the correlations between the transmitted electrons in such processes. Here, we use a local shot-noise measurement apparatus, operating at low temperatures, to investigate shot noise in single-atom Pb-Pb junctions. We observe charge doubling inside the superconducting gap and an unexpected deviation from the thermal limit at zero bias voltage.