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TT: Fachverband Tiefe Temperaturen

TT 49: Poster Session: Superconductivity

TT 49.22: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Single-Channel Josephson Effect in a High-Transmission Atomic ContactJacob Senkpiel1, •Simon Dambach2, Markus Etzkorn1, Robert Drost1, Ciprian Padurariu2, Björn Kubala2, Wolfgang Belzig3, Alfredo Levy Yeyati4, Juan Carlos Cuevas4, Joachim Ankerhold2, Christian R. Ast1, and Klaus Kern1,51Max-Planck-Institut für Festkörperforschung, Germany — 2Institut für komplexe Quantensysteme, Universität Ulm, Germany — 3Fachbereich Physik, Universität Konstanz, Germany — 4Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Spain — 5Institut de Physique, École Polytechnique Fédérale de Lausanne, Switzerland

The Josephson effect in scanning tunneling microscopy is an excellent tool to probe the properties of the superconducting order parameter on a local scale through the Ambegaokar-Baratoff (AB) relation. Using single atomic contacts created by means of atom manipulation, we demonstrate that in the extreme case of a single transport channel through the atomic junction, modifications of the current-phase relation lead to significant deviations from the linear AB formula. Using the full current-phase relation for arbitrary transmission, we model the Josephson effect in the dynamical–Coulomb-blockade regime because the charging energy of the junction capacitance cannot be neglected. We find excellent agreement with the experimental data. Projecting the current-phase relation onto the charge-transfer operator shows that at high transmission multi–Cooper-pair tunneling processes may occur.
J. Senkpiel et al., arXiv:1810.10609.

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DPG-Physik > DPG-Verhandlungen > 2019 > Regensburg