Darmstadt 2008 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 2: Quantum gases I (jointly with Q)

A 2.4: Gruppenbericht

Montag, 10. März 2008, 15:30–16:00, 1A

Strong dipolar effects in Chromium Bose-Einstein condensates (Gruppenbericht) — •Jonas Metz, Bernd Fröhlich, Tobias Koch, Thierry Lahaye, Axel Griesmaier, and Tilman Pfau — 5. Physikalisches Institut, Universität Stuttgart

The experimental observation of strong dipolar effects in a Bose-Einstein condensate of Chromium are presented. Starting with dipolar interactions which perturb the usual contact interactions, we use a Feshbach resonance to reduce and finally switch off the contact interaction. We investigate the stability diagram of a purely dipolar gas for various trap shapes and find a universal behaviour in the large N case for all dipolar gases. We then induce a dipolar collapse and study the dynamics. Quantitative comparison with theoretical calculations by the Ueda group of Tokyo University are presented. The symmetry of the dipolar interaction is observed in the collapse products.