Dresden 2006 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Tiefe Temperaturen
TT 7: Superconductivity & Solids At Low Temperature - Poster Session
TT 7.45: Poster
Montag, 27. März 2006, 14:00–17:45, P1
Magnetotransport and Josephson Effect in Periodic Superconductor/2DEG Structures — •Franziska Rohlfing1, Gustaaf Borghs2, Dieter Weiss1, and Christoph Strunk1 — 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Germany — 2IMEC, Leuven, Belgium
We report on differential resistance measurements of arrays of multiple Josephson junctions as a function of out-of-plane and in-plane magnetic field. The junction array is made of 80 400 nm wide niobium stripes in 600 nm distance in good metallic contact with the two-dimensional electron gas in an InAs quantum well. The differential resistance shows oscillations in the out-of-plane magnetic field with an oscillation period determined by the area of a single junction. A trapezoidal modulation of the stripe width results in additional minima in the resistance at higher fields, indicative of a two-dimensional network of Josephson junctions. The supercurrent at 0.4 K is suppressed down to 10% by a parallel magnetic field on a scale of 20 mT, while a small fraction of the supercurrent survives up to 300 mT.