Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 23: Poster II

A 23.27: Poster

Donnerstag, 11. März 2010, 16:30–19:00, Lichthof

Strong dipolar effects in Chromium Bose-Einstein condensates — Stefan Mueller, •Jonas Metz, Yong Wan, Ashok Mohapatra, Axel Griesmaier, and Tilman Pfau — 5. Physikalisches Institut, Universität Stuttgart

We present an overview of experimental observations of strong dipolar effects in a Bose-Einstein condensate of chromium. Starting with dipolar interactions which perturb the usual contact interactions, we use a Feshbach resonance to reduce and finally switch off the contact interactions. Investigating the stability diagram of a dipolar gas for various trap shapes we find a universal behaviour in the large N case for all dipolar gases. By inducing a dipolar collapse we study its dynamics and observe the d-wave symmetry of the dipolar interaction in the collapse products. Finally, in order to probe the phase coherence of collapsed condensates, we induce the collapse in several condensates simultaneously and let them interfere.