Ramsey interferometry with atoms and molecules: two-body versus many-body phenomena
arXiv:cond-mat/0407627 · doi:10.1103/PhysRevA.71.023603
Abstract
We discuss the frequency and visibility of atom-molecule Ramsey fringes observed in recent experiments by Claussen et al.[Phys. Rev. A 67, 060701 (2003)]. In these experiments a 85Rb Bose-Einstein condensate was exposed to a sequence of magnetic field pulses on the high field side of the 155 G Feshbach resonance. The observed oscillation frequencies largely agree with the theoretically predicted magnetic field dependence of the binding energy of the highest excited diatomic vibrational state, except for a small region very close to the singularity of the scattering length. Our analytic treatment of the experiment, as well as our dynamical simulations, follow the magnitude of the measured oscillation frequencies as well as the visibilities of the Ramsey fringes. We show that significant deviations from a purely binary dynamics, with an associated binding frequency, occur when the spatial extent of the molecular wave function becomes comparable with the mean distance between the atoms in the dilute gas. The experiments thus clearly identify the conditions under which diatomic molecules may be identified as a separate entity of the gas or, conversely, when the concept of binary physics in a many-body environment is bound to break down.
22 pages, 12 eps figures; final version
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Cited by in corpus (10)
- Production of cold molecules via magnetically tunable Feshbach resonances
- Bound-state signatures in quenched Bose-Einstein condensates
- Nonlinear Ramsey interferometry with the Rosen-Zener pulses on a two-component Bose-Einstein condensate
- Ultracold gases far from equilibrium
- Ballistic quench-induced correlation waves in ultracold gases
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- Molecular Feshbach dissociation as a source for motionally entangled atoms
- Formation of molecules from a Cs Bose-Einstein condensate
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- Optimal conversion of Bose condensed atoms into molecules via a Feshbach resonance