Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-06-10
Physics
Condensed Matter
Quantum Gases
4 pages, 3 figures, 59 references. v2: discussion added; to appear in PRA
Scientific paper
We briefly report on zero-temperature photoassociation of a Bose-Einstein condensate, focusing on the many-body rate limit for atom-molecule conversion. An upgraded model that explicitly includes spontaneous radiative decay leads to an unanticipated shift in the position of the photoassociation resonance, which affects whether the rate (constant) maximizes or saturates, as well as the limiting value itself. A simple analytical model agrees with numerical experiments, but only for high density. Finally, an explicit comparison with the two-body unitary limit, set by the size of the condensate, finds that the many-body rate limit is generally more strict.
Mackie Matt
Phou Pierre
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