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TT: Fachverband Tiefe Temperaturen

TT 34: Superconductivity: Tunneling and Josephson Junctions

TT 34.11: Vortrag

Dienstag, 13. März 2018, 12:30–12:45, H 2053

Single Channel Josephson Effect in a High Transmission Tunnel Junction — •Christian R. Ast¹, Jacob Senkpiel¹, Simon Dambach², Björn Kubala², Ciprian Padurariu², Berthold Jäck¹, Markus Etzkorn¹, Juan Carlos Cuevas³, Joachim Ankerhold², and Klaus Kern¹ — ¹MPI für Festkörperforschung, Stuttgart — ²Institut für Komplexe Quantensysteme, Universität Ulm — ³Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Spain

Andreev bound states lie at the heart of many phenomena involving scattering with superconductors, such as Yu-Shiba-Rusinov states, Majorana bound states, or the Josephson effect. In most cases it is sufficient to approximate the Josephson effect by an ensemble of many, nearly opaque transport channels. However, in scanning tunneling microscopy (STM), where only very few transport channels are realized and arbitrary transmissions can be achieved, this approximation may break down and the full energy-phase relation of the Andreev bound states has to be considered. Using the manipulation techniques available to STM, we exploit a single atom contact at high transmission to demonstrate the consequences of single channel transport for the Josephson effect. We demonstrate single channel transport through the analysis of multiple Andreev reflections at various transmission setpoints and discuss the transition from the tunneling approximation to the full Andreev bound state description in the dynamical Coulomb blockade regime.