Journal
JOURNAL OF STATISTICAL PHYSICS
Volume 115, Issue 1-2, Pages 57-89Publisher
SPRINGER
DOI: 10.1023/B:JOSS.0000019829.71660.40
Keywords
Bose and Fermi degenerate gases; superfluidity and superconductivity; evaporative cooling; sympathetic cooling; nonequilibrium statistical mechanics; Bose-Fermi mixtures
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The study of low density, ultracold atomic Fermi gases is a promising avenue to understand fermion superfluidity from first principles. One technique currently used to bring Fermi gases in the degenerate regime is sympathetic cooling through a reservoir made of an ultracold Bose gas. We discuss a proposal for trapping and cooling of two-species Fermi-Bose mixtures into optical dipole traps made from combinations of laser beams having two different wavelengths. In these bichromatic traps it is possible, by a proper choice of the relative laser powers, to selectively trap the two species in such a way that fermions experience a stronger confinement than bosons. As a consequence, a deep Fermi degeneracy can be reached having at the same time a softer degenerate regime for the Bose gas. This leads to an increase in the sympathetic cooling efficiency and allows for higher precision thermometry of the Fermi - Bose mixture.
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