Making cold molecules by time-dependent feshbach resonances |
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| Authors: | Paul S Julienne Eite Tiesinga Thorsten Köhler |
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| Affiliation: | 1. Atomic Physics Division , National Institute of Standards and Technology , 100 Bureau Drive, Stop 8423, Gaithersburg, MD, 20899-8423, USA;2. Clarendon Laboratory, Department of Physics , University of Oxford , Parks Road, Oxford, OX1 3PU, UK |
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| Abstract: | Abstract Pairs of trapped atoms can be associated to make a diatomic molecule using a time-dependent magnetic field to ramp the energy of a scattering resonance state from above to below the scattering threshold. A relatively simple model, parametrized in terms of the background scattering length and resonance width and magnetic moment, can be used to predict conversion probabilities from atoms to molecules. The model and its Landau-Zener interpretation are described and illustrated by specific calculations for 23Na, 87Rb and 133Cs resonances. The model can be readily adapted to Bose-Einstein condensates. Comparison with full many-body calculations for the condensate case shows that the model is very useful for making simple estimates of molecule conversion efficiencies. |
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