Physics – Atomic Physics
Scientific paper
2002-09-23
M. Weidemueller and C. Zimmermann (Eds.), Interactions in Ultracold Gases: From Atoms to Molecules (Wiley-VCH, Weinheim, 2003)
Physics
Atomic Physics
10 pages, 4 figures, to appear in Proceedings of Cool Interactions 2002 (Wiley)
Scientific paper
Recent Feshbach-resonance experiments with 85Rb Bose-Einstein condensates have led to a host of unexplained results: dramatic losses of condensate atoms for an across-resonance sweep of the magnetic field, a collapsing condensate with a burst of atoms emanating from the remnant condensate, increased losses for decreasing interaction times--until very short times are reached, and coherent oscillations between remnant and burst atoms. In particular, the amplitude of the remnant-burst oscillations, and the corresponding missing atoms, have prompted speculation as to the formation of a molecular condensate. Using a minimal mean-field model, we find that rogue dissociation, molecular dissociation to noncondensate atom pairs, is qualitatively implicated as the physical mechanism responsible for these observations, although very little molecular condensate is formed. Refining the model provides excellent quantitative agreement with the experimental remnant-burst oscillations, and the fraction of molecular condensate accounts almost entirely for the measured atom loss.
Javanainen Juha
Mackie Matt
Suominen Kalle-Antti
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