Frankfurt 2006 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 38: Quantengase IV
Q 38.4: Vortrag
Mittwoch, 15. März 2006, 11:25–11:40, HVI
Nonlinear Transport of Bose-Einstein Condensates Through Waveguides with Disorder — •Tobias Paul1, Nicolas Pavloff1, Patricio Leboeuf2, Klaus Richter2, and Peter Schlagheck1 — 1Institut für Theoretische Physik, Universität Regensburg — 2Laboratoire de Physique Théorique et Modèles Statistiques, Université Paris Sud, Orsay
The coherent flow of a Bose-Einstein condensate in a disordered magnetic waveguide is investigated. We present analytical and numerical studies of realistic transport processes in quasi one-dimensional disorder potentials that are created on atom chips. We find that a repulsive interaction between the condensate atoms induces different transport regimes. For weak interactions we observe a stationary flow which shows typical signatures of localization; in this regime the transmission decreases exponentially with the length of the disorder region [1]. We identify a critical value for the interaction beyond which the system exhibits a transition towards a time-depedent flow with an algebraic decay of the time-averaged transmission. A comparison to a full three-dimensional simulation of the transport process through the disordered waveguide is finally presented.
[1] T.Paul, P.Leboeuf, N.Pavloff, K.Richter, P.Schlagheck, cond-mat 0509446 (2005), accepted for publication in Phys. Rev. A