Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-12-27
Phys. Rev. A 78, 013618 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7pages 5figures
Scientific paper
10.1103/PhysRevA.78.013618
We investigate the dynamics of converting cold bosonic atoms to molecules when an external magnetic field is swept across a Feshbach resonance. Our analysis relies on a zero temperature quantum microscopic model that accounts for many-body effects, triggering the association process. We show that the picture of two-body molecular production depicted by Landau-Zener model is significantly altered due to many-body effects. In nonadiabatic regime, we derive an analytic expression for molecular conversion efficiency that explains the discrepancy between the prediction of Landau-Zener formula and experimental data[Hodby et al., Phys. Rev. Lett. {\bf 94}, 120402 (2005)]. Our theory is further extended to the formation of heteronuclear diatomic molecules and gives some interesting predictions.
Fu Libin
Liu Bin
Liu Jie
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