410 research outputs found
Formation of molecules from a Cs Bose-Einstein condensate
Conversion of an expanding Bose-Einstein condensate of Cs atoms to a
molecular one with an efficiency of more than 30% was observed recently in
experiments by M. Mark et al., Europhys. Lett. 69, 706 (2005). The theory
presented here describes the experimental results. Values of resonance strength
of 8 mG and rate coefficients for atom-molecule deactivation of cms and molecule-molecule one of
cms are estimated by a fit of the theoretical results to the
experimental data. Near the resonance, where the highest conversion efficiency
was observed, the results demonstrate strong sensitivity to the magnetic field
ripple and inhomogeneity. A conversion efficiency of about 60% is predicted by
non-mean-field calculations for the densities and sweep rates lower than the
ones used in the experiments.Comment: 9 pages, 10 figure
Properties of quasi-one-dimensional molecules with Feshbach resonance interaction
Bound states and collisions of atoms with two-channel two-body interactions
in harmonic waveguides are analyzed. The closed-channel contributions to
two-atom bound states become dominant in the case of a weak resonance. At low
energies and values of the non-resonant scattering length the problem can be
approximated by a one-dimensional resonant model. Three-body problem becomes
nonintegrable and the properties of triatomic molecules become different from
those predicted by the integrable Lieb-Liniger-McGuire model.Comment: 7 pages, 5 figure
Feshbach resonance scattering under cylindrical harmonic confinement
A problem of collisions of atoms with two-channel zero-range interaction in
an atomic waveguide is solved by using of a renormalization procedure. A
matching of the solution to a solution of the related one-dimensional problem
leads to relation between the one-dimensional and three-dimensional scattering
parameters. The scattering amplitude and bound states for the confined system
demonstrate differences from the related free and one-dimensional systems.Comment: Completely rewritten version,8 pages with 5 figures, uses REVTe
Formation of Two Component Bose Condensate During the Chemical Potential Curve Crossing
In this article we study the formation of the two modes Bose-Einstein
condensate and the correlation between them. We show that beyond the mean field
approximation the dissociation of a molecular condensate due to the chemical
potential curve crossing leads to the formation of two modes condensate. We
also show that these two modes are correlated in a two mode squeezed state.Comment: 10 page
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