Production Efficiency of Ultracold Feshbach Molecules in Bosonic and Fermionic Systems

Details Production Efficiency of Ultracold Feshbach Molecules in Bosonic and Fermionic Systems Production Efficiency of Ultracold Feshbach Molecules in Bosonic and Fermionic Systems

2004-11-18

arxiv.org/abs/cond-mat/0411487v2

Physics

Condensed Matter

Statistical Mechanics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.94.120402

We investigate the production efficiency of ultracold molecules in bosonic $^{85}$Rb and fermionic $^{40}$K when the magnetic field is swept across a Feshbach resonance. For adiabatic sweeps of the magnetic field, the conversion efficiency of each species is solely determined by the phase space density of the atomic cloud, in contrast to a number of theoretical predictions. Our novel model for the adiabatic pairing process, developed from general physical principles, accurately predicts the conversion efficiency for {\it both} ultracold gases of bosons and of fermions. In the non-adiabatic regime our measurements of the $^{85}$Rb molecule conversion efficiency follow a Landau Zener model, with a conversion efficiency that is characterized by the density divided by the time derivative of the magnetic field.

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