Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 12: Quantengase (Unordnung)

Q 12.5: Vortrag

Montag, 19. März 2007, 17:30–17:45, 6J

Bose-Einstein Condensates in Disordered Lattice Potentials — •Sascha Drenkelforth, Thomas Schulte, Georg Kleine Büning, Wolfgang Ertmer, and Jan Arlt — Institut für Quantenoptik, Universität Hannover, Welfengarten 1, 30167 Hannover

Optical lattices are excellent tools to probe the nature of quantum degenerate Bose gases and serve as an ideal testing ground for theories originating in condensed matter physics. The addition of small pseudorandom potentials can disturb ideal lattice configurations and allows for the introduction of disorder in the experimental system. Depending on the experimental parameters this disorder is predicted to lead to the formation of new phases in the strongly interacting and the weakly interacting case. In the weakly interacting regime an observation of non-trivial localization effects and a full analysis including the interplay of interactions and localization in the system is still outstanding.

We will report on the realization of a disordered lattice and discuss the effect of the nonlinear interactions and the shape of the disorder potential in detail. The investigation of transport phenomena is of particular relevance for the understanding of disordered potentials in the solid state case. We have therefore addressed the use of Bloch oscillations as a probe of the disorder in our system. We will present our theoretical results on these Bloch oscillations in disordered optical lattice potentials