Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 8: Superconductivity - Poster Session

TT 8.35: Poster

Montag, 26. März 2007, 14:00–17:45, Poster A

Superconductor-Constriction-Superconductor Josephson Junction in a Magnetic Field — •Andreas Gumann, Thomas Dahm, and Nils Schopohl — Universität Tübingen, Lehrstuhl für Theoretische Festkörperphysik, Auf der Morgenstelle 14, 72076 Tübingen

Josephson junctions can be formed by a constriction of a superconducting material with lateral extension smaller than the coherence length. This kind of weak link, often referred to as ScS Josephson junction, is a useful starting point for theoretical considerations since only the properties of the superconductor and the geometry are relevant. We present self-consistent solutions of microscopic Eilenberger theory for a two-dimensional model of a ScS Josephson junction including magnetic fields, external ones as well as those generated by the screening and transport currents. We show results for the order parameter amplitude and phase, the currents, the magnetic vector potential and the local density of states. In particular, the effect of the external magnetic field on the Andreev bound states appearing in the junction is studied.