Mean-field theory of Feshbach-resonant interactions in 85Rb condensates.

  title={Mean-field theory of Feshbach-resonant interactions in 85Rb condensates.},
  author={Matt Mackie and Kalle-Antti Suominen and Juha Javanainen},
  journal={Physical review letters},
  volume={89 18},
Recent Feshbach-resonance experiments with 85Rb Bose-Einstein condensates have led to a host of unexplained results: dramatic losses of condensate atoms for an across-resonance sweep of the magnetic field, a collapsing condensate with a burst of atoms emanating from the remnant condensate, increased losses for decreasing interaction times, and coherent oscillations between remnant and burst atoms. Using a simple yet realistic mean-field model, we find that rogue dissociation, molecular… 

Topics from this paper

Feshbach resonances and collapsing Bose-Einstein condensates
We investigate the quantum state of burst atoms seen in the recent Rb-85 experiments at JILA. We show that the presence of a resonance scattering state can lead to a pairing instability generating an
Reaction diffusion equation in the ultra cold coexisting atomic and molecular condensates and the importance of Feshbach interaction
AbstractWe consider a gas of bosonic atoms near a Feshbach resonance. The dynamics of the atomic and molecular condensates can be described in the limit of small fluctuations by a set of coupled
The Josephson frequency of resonantly coupled atomic and molecular condensates
Motivated by recent experiments (Claussen et al 2003 Preprint cond-mat/0302195) we investigate the magnetic-field dependence of the Josephson frequency of coherent atom–molecule oscillations near a
Heating and atom loss during upward ramps of Feshbach resonance levels in Bose-Einstein condensates
The production of pairs of fast atoms leads to a pronounced loss of atoms during upward ramps of Feshbach resonance levels in dilute Bose-Einstein condensates. We provide comparative studies on the
Theory of Combined Photoassociation and Feshbach Resonances in a Bose-Einstein Condensate
We model combined photoassociation and Feshbach resonances in a Bose-Einstein condensate, where the shared dissociation continuum allows for quantum interference in losses from the condensate, as
LETTER TO THE EDITOR: Atom loss from the 85Rb Bose Einstein condensate by a Feshbach resonance
Loss of atoms from a 85Rb condensate on passage through a Feshbach resonance is analysed using the generalized parametric approximation that takes into account quantum many-body effects. These
Elimination of Feshbach loss in a Bose–Einstein condensate
We suggest a technique to eliminate inelastic losses in an atomic condensate when tuned close to a Feshbach resonance. The key idea is to couple the quasi-bound molecular state to a bound molecular
Hartree-Fock-Bogoliubov model and simulation of attractive and repulsive Bose-Einstein condensates
We describe a model of dynamic Bose-Einstein condensates near a Feshbach resonance that is computationally feasible under assumptions of spherical or cylindrical symmetry. Simulations in spherical
Adiabatic association of ultracold molecules via magnetic-field tunable interactions
We consider in detail the situation of applying a time-dependent external magnetic field to a 87Rb atomic Bose–Einstein condensate held in a harmonic trap, in order to adiabatically sweep the
Density-optimized efficiency for magneto-optical production of a stable molecular Bose–Einstein condensate
Although photoassociation and the Feshbach resonance are feasible means in principle for creating a molecular Bose–Einstein condensate (MBEC) from an already quantum-degenerate gas of atoms,