Paradoxe Antwort- und Fluktuationseffekte in Josephson-Kontakten

19/10/2006 to 08/08/2011

In this project two different, quite unusual pheomena in Josephson junctions are investigated theoretically and experimentally: 1. Absolute negative resistance, i.e. the system generates a negative voltage as a response to a positive applied electric current and vice versa. 2. A reduction in temperature causes an increase of the quantum mechanical tunneling rate in appropriately arranged Josephson junctions, and hence of the electric voltage drop across a system biased at constant current. The project is performed in close collaboration between the groups in theoretical physics (P. Reimann and R. Eichhorn, Bielefeld) and in experimental physics (D. Kölle and R. Kleiner, Tübingen). We implement theoretical predictions experimentally by using Josephson junctions. Furthermore, novel experimental results in such systems are analyzed theoretically.

Joint project with P. Reimann, R. Eichhorn (Univ. Bielefeld)