Observation of a Degenerate Fermi Gas Trapped by a Bose-Einstein Condensate

Abstract

We report on the formation of a stable quantum degenerate mixture of fermionic ${}^6$Li and bosonic ${}^{133}$Cs in an optical trap by sympathetic cooling near an interspecies Feshbach resonance. New regimes of the quantum degenerate mixtures are identified. With moderate attractive interspecies interactions, we show that a degenerate Fermi gas of Li can be fully confined in the Cs condensate without external potentials. For stronger attraction where mean-field collapse is expected, no such instability is observed. In this case, we suggest the stability is a result of dynamic equilibrium, where the interspecies three-body loss prevents the collapse. Our picture is supported by a rate equation model, and the crossover between the thermalization rate and the observed inelastic loss rate in the regime where the mean-field collapse is expected to occur.

arXiv comment6 Pages, 4 Figures

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