%0 Journal Article
%J Physical Review Letters
%D 2008
%T Two-body transients in coupled atomic-molecular BECs
%A Pascal Naidon
%A Eite Tiesinga
%A Paul S. Julienne
%X We discuss the dynamics of an atomic Bose-Einstein condensate when pairs of atoms are converted into molecules by single-color photoassociation. Three main regimes are found and it is shown that they can be understood on the basis of time-dependent two-body theory. In particular, the so-called rogue dissociation regime [Phys. Rev. Lett., 88, 090403 (2002)], which has a density-dependent limit on the photoassociation rate, is identified with a transient regime of the two-atom dynamics exhibiting universal properties. Finally, we illustrate how these regimes could be explored by photoassociating condensates of alkaline-earth atoms.
%B Physical Review Letters
%V 100
%8 2008/3/3
%G eng
%U http://arxiv.org/abs/0707.2963v2
%N 9
%! Phys. Rev. Lett.
%R 10.1103/PhysRevLett.100.093001
%0 Journal Article
%D 2007
%T Coherent, adiabatic and dissociation regimes in coupled atomic-molecular Bose-Einstein condensates
%A Pascal Naidon
%A Eite Tiesinga
%A Paul S. Julienne
%X We discuss the dynamics of a Bose-Einstein condensate of atoms which is suddenly coupled to a condensate of molecules by an optical or magnetic Feshbach resonance. Three limiting regimes are found and can be understood from the transient dynamics occuring for each pair of atoms. This transient dynamics can be summarised into a time-dependent shift and broadening of the molecular state. A simple Gross-Pitaevskii picture including this shift and broadening is proposed to describe the system in the three regimes. Finally, we suggest how to explore these regimes experimentally.
%8 2007/11/02
%G eng
%U http://arxiv.org/abs/0711.0397v2
%0 Journal Article
%J New Journal of Physics
%D 2007
%T Effective-range description of a Bose gas under strong one- or two-dimensional confinement
%A Pascal Naidon
%A Eite Tiesinga
%A William F. Mitchell
%A Paul S. Julienne
%X We point out that theories describing s-wave collisions of bosonic atoms confined in one- or two-dimensional geometries can be extended to much tighter confinements than previously thought. This is achieved by replacing the scattering length by an energy-dependent scattering length which was already introduced for the calculation of energy levels under 3D confinement. This replacement accurately predicts the position of confinement-induced resonances in strongly confined geometries.
%B New Journal of Physics
%V 9
%P 19 - 19
%8 2007/01/29
%G eng
%U http://arxiv.org/abs/physics/0607140v2
%N 1
%! New J. Phys.
%R 10.1088/1367-2630/9/1/019