01063nas a2200145 4500008004100000245005700041210005500098260001300153490000800166520064500174100001900819700001900838700002300857856003700880 2008 eng d00aTwo-body transients in coupled atomic-molecular BECs0 aTwobody transients in coupled atomicmolecular BECs c2008/3/30 v1003 a 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.
1 aNaidon, Pascal1 aTiesinga, Eite1 aJulienne, Paul, S. uhttp://arxiv.org/abs/0707.2963v201051nas a2200133 4500008004100000245010600041210006900147260001500216520058800231100001900819700001900838700002300857856003700880 2007 eng d00aCoherent, adiabatic and dissociation regimes in coupled atomic-molecular Bose-Einstein condensates
0 aCoherent adiabatic and dissociation regimes in coupled atomicmol c2007/11/023 a 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.
1 aNaidon, Pascal1 aTiesinga, Eite1 aJulienne, Paul, S. uhttp://arxiv.org/abs/0711.0397v201036nas a2200169 4500008004100000245009800041210006900139260001500208300001200223490000600235520049500241100001900736700001900755700002600774700002300800856004300823 2007 eng d00aEffective-range description of a Bose gas under strong one- or two-dimensional confinement
0 aEffectiverange description of a Bose gas under strong one or two c2007/01/29 a19 - 190 v93 a 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.
1 aNaidon, Pascal1 aTiesinga, Eite1 aMitchell, William, F.1 aJulienne, Paul, S. uhttp://arxiv.org/abs/physics/0607140v2