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Q: Quantenoptik und Photonik
Q 17: Festkörperlaser II
Q 17.4: Talk
Monday, March 13, 2006, 17:45–18:00, HIV
Bose Gas in Disorder Potential With Arbitrary Correlation — •Patrick Navez1, Axel Pelster2, and Robert Graham2 — 1Labo Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, Celestijnlaan 200 D, B-3001 Heverlee, Belgium — 2Fachbereich Physik, Universität Duisburg-Essen, Universitätsstraße 5, 45117 Essen, Germany
We consider a dilute, weakly interacting Bose gas moving in a Gaussian distributed frozen disorder potential V (x). Depending on the disorder correlation function V (x1)V (x2) = R(x1 − x2), this model describes superfluid helium in porous media or cold atoms trapped by magnetic fields along wires with current irregularities. In our approach we interpret the underlying zero temperature Gross-Pitaevskii equation as a spatial Langevin equation and calculate disorder ensemble averages from it. The resulting condensate and superfluid densities are determined as a function of the disorder correlation length.