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

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Abstract

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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  1. Dipartimento di Fisica “G. Galilei,”, Università di Padova, Via Marzolo 8, Padova, 35131, Italy

    Roberto Onofrio & Carlo Presilla

  2. Unità di Roma 1 and Center for Statistical Mechanics and Complexity, Istituto Nazionale per la Fisica della Materia, Roma, 00185, Italy

    Roberto Onofrio & Carlo Presilla

  3. Los Alamos National Laboratory, Los Alamos, New Mexico, 87545

    Roberto Onofrio

  4. Istituto Nazionale di Fisica Nucleare, Sezione di Roma 1, Roma, 00185, Italy

    Carlo Presilla

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Onofrio, R., Presilla, C. Ultracold Atomic Fermi–Bose Mixtures in Bichromatic Optical Dipole Traps: A Novel Route to Study Fermion Superfluidity. Journal of Statistical Physics 115, 57–89 (2004). https://doi.org/10.1023/B:JOSS.0000019829.71660.40

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