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The study of low density, ultracold atomic Fermi gases is a promising avenueto understand fermion superfluidity from first principles. One techniquecurrently used to bring Fermi gases in the degenerate regime is sympatheticcooling through a reservoir made of an ultracold Bose gas. We discuss aproposal for trapping and cooling of two-species Fermi-Bose mixtures intooptical dipole traps made from combinations of laser beams having two differentwavelengths. In these bichromatic traps it is possible, by a proper choice ofthe relative laser powers, to selectively trap the two species in such a waythat fermions experience a stronger confinement than bosons. As a consequence,a deep Fermi degeneracy can be reached having at the same time a softerdegenerate regime for the Bose gas. This leads to an increase in thesympathetic cooling efficiency and allows for higher precision thermometry ofthe Fermi-Bose mixture

Ultracold Atomic Fermi–Bose Mixtures in Bichromatic Optical Dipole Traps: A Novel Route to Study Fermion Superfluidity