Production efficiency of ultracold feshbach molecules in bosonic and fermionic systems

We investigate the production efficiency of ultracold molecules in bosonic 85Rb and fermionic 40K when the magnetic field is swept across a Feshbach resonance. For adiabatic sweeps of the magnetic field, our novel model shows that the conversion efficiency of both species is solely determined by the...

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Bibliographic Details
Published in:Physical review letters 2005-04, Vol.94 (12), p.120402.1-120402.4, Article 120402
Main Authors: HODBY, E, THOMPSON, S. T, REGAL, C. A, GREINER, M, WILSON, A. C, JIN, D. S, CORNELL, E. A, WIEMAN, C. E
Format: Article
Language:English
Subjects:
Exact sciences and technology
Physics
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Summary:We investigate the production efficiency of ultracold molecules in bosonic 85Rb and fermionic 40K when the magnetic field is swept across a Feshbach resonance. For adiabatic sweeps of the magnetic field, our novel model shows that the conversion efficiency of both species is solely determined by the phase space density of the atomic cloud, in contrast with a number of theoretical predictions. In the nonadiabatic regime our measurements of the 85Rb molecule conversion efficiency follow a Landau-Zener model.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.94.120402