Physics – Condensed Matter – Quantum Gases
Scientific paper
2009-12-26
Physics
Condensed Matter
Quantum Gases
10 pages, 5 figures, 82 references
Scientific paper
We model combined photoassociation and Feshbach resonances in a Bose-Einstein condensate, where the shared dissociation continuum allows for quantum interference in losses from the condensate, as well as a dispersive-like shift of resonance. A simple analytical model, based on the limit of weakly bound molecules, agrees well with numerical experiments that explicitly include dissociation to noncondensate modes. For a resonant laser and an off-resonant magnetic field, constructive interference enables saturation of the photoassociation rate at user-friendly intensities, at a value set by the interparticle distance. This rate limit is larger for smaller condensate densities and, near the Feshbach resonance, approaches the rate limit for magnetoassociation alone. Also, we find agreement with the unitary limit--set by the condensate size--only for a limited range of near-resonant magnetic fields. Finally, for a resonant magnetic field and an off-resonant laser, magnetoassociation displays similar quantum interference and a dispersive-like shift. Unlike photoassociation, interference and the fieldshift in resonant magnetoassociation is tunable with both laser intensity and detuning. Also, the dispersive-like shift of the Feshbach resonance depends on the size of the Feshbach molecule, and is a signature of non-universal physics in a strongly interacting system.
DeBrosse Catherine
Mackie Matt
No associations
LandOfFree
Theory of Combined Photoassociation and Feshbach Resonances in a Bose-Einstein Condensate does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Theory of Combined Photoassociation and Feshbach Resonances in a Bose-Einstein Condensate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Theory of Combined Photoassociation and Feshbach Resonances in a Bose-Einstein Condensate will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-122508