Berlin 2005 – wissenschaftliches Programm

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SYUA: Mesoscopic Physics of Ultracold Atoms

SYUA 1: Atom Chip Physics

SYUA 1.3: Hauptvortrag

Mittwoch, 9. März 2005, 12:00–12:30, HU Audimax

Nonlinear resonant transport of Bose-Einstein condensates — •Peter Schlagheck — Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany

The rapid progress of atom chip technology opens the perspective for experiments that probe the transport of Bose-Einstein condensates through mesoscopic waveguides. Particularly interesting in this context is the propagation of the condensate through a double barrier potential created by a sequence of two constrictions in the waveguide, which can serve as a Fabry-Perot interferometer for the condensate. We show that resonant is suppressed in interaction-induced regimes of bistability, where multiple scattering states exist at the same chemical potential and the same incident current. We demonstrate, however, that a temporal control of the external potential can be used to circumvent this limitation and to obtain enhanced transmission near the resonance on experimentally realistic time scales.