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TT: Fachverband Tiefe Temperaturen

TT 17: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs

TT 17.3: Talk

Monday, March 31, 2014, 15:30–15:45, HSZ 201

Tuning the ground state of a ϕ-Josephson junction with current injectors — •Matthias Zimmermann, Karl Vogel, and Wolfgang Schleich — Institut für Quantenphysik, Universität Ulm, D-89069 Ulm

We propose to use a pair of tiny current injectors to control the ground states of a ϕ-Josephson junction. The system is based on a 0−π-Josephson junction with different lengths of the 0- and π-regions. To describe this asymmetric system, we use analytic solutions of the Sine-Gordon equation and apply an external magnetic field as additional control parameter. As a result we are able to calculate the energy of the stationary states as a function of the injected current and the external magnetic field. Furthermore, we show that the injected current can be used to prepare the Josephson junction in one of its doubly degenerate ground states.