Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 40: Transport and Localization of interacting Bosons 1
Q 40.5: Vortrag
Mittwoch, 16. März 2011, 17:30–17:45, HSZ 02
Interaction-based reduction of weak localization in coherent transport of Bose Einstein Condensates — •Josef Michl1, Timo Hartmann1, Juan Diego Urbina1, Cyril Petitjean2, Thomas Wellens3, Peter Schlagheck4, and Klaus Richter1 — 1Institute of Theoretical Physics, University of Regensburg, Germany — 2SPSMS-INAC-CEA, Grenoble, France — 3Physics Department, University of Fribourg, Switzerland — 4Physics Department, University of Liège, Belgium
Based on the Gross-Pitaevskii-equation, we investigate reflection amplitudes and reflection probabilities in the transport of coherent bosonic matter waves through a fully-chaotic two-dimensional billiard-system. Like in the case of electronic transport, one can observe the effect of weak-localization in this setting. Our interest lies now in the influence of a weak interaction between particles on the weak-localization-peak and its behaviour in the presence of a weak magnetic field in the billiard.
Numerical results on this topic predict a reduction of the weak-localization-peak for small magnetic fields and a vanishing influence of the interaction with an increasing one. Trying to explain that, an analytical technique based on a semiclassical treatment in form of a diagrammatic perturbation theory in the parameter representing the interaction will be presented. Its results are compared to the numerical findings.