Monday, January 30, 2012

1201.5416 (Chen Zhang et al.)

Few-body ultracold reactions in a Bose-Fermi mixture    [PDF]

Chen Zhang, Javier von Stecher, Chris H. Greene
The spectrum of two bosons and two fermions in a trap is calculated using a
correlated-Gaussian basis throughout the range of a broad Fano-Feshbach
resonance. The calculations provide a few-body solution to the
magneto-association of fermionic Feshbach molecules. This solution is used to
study the time evolution of the system as the scattering length changes,
mimicking experiments with Bose-Fermi mixtures near Fano-Feshbach resonances.
The structure of avoided crossings in the few-body spectrum enables an
interpretation of the dynamics of the system as a sequence of Landau-Zener
transitions. The calculated molecule formation rate is compared with
experimental observations.
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