Role of Particle Interactions in the Feshbach Conversion of Fermion Atoms to Bosonic Molecules

Details Role of Particle Interactions in the Feshbach Conversion of Fermion Atoms to Bosonic Molecules Role of Particle Interactions in the Feshbach Conversion of Fermion Atoms to Bosonic Molecules

2007-04-30

arxiv.org/abs/0704.3867v3

New J. Phys. 10 (2008) 123018

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1088/1367-2630/10/12/123018

We investigate the Feshbach conversion of fermion atomic pairs to condensed boson molecules with a microscopic model that accounts the repulsive interactions among all the particles involved. We find that the conversion efficiency is enhanced by the interaction between boson molecules while suppressed by the interactions between fermion atoms and between atom and molecule. In certain cases, the combined effect of these interactions leads to a ceiling of less than 100% on the conversion efficiency even in the adiabatic limit. Our model predicts a non-monotonic dependence of the efficiency on mean atomic density. Our theory agrees well with recent experiments on $^6$Li and $^{40}$K.

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