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.

6 Pages, 4 Figures

References in corpus (19)

• A High Phase-Space-Density Gas of Polar Molecules
• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Ultracold dense samples of dipolar RbCs molecules in the rovibrational and hyperfine ground state
• Ultracold Dipolar Gas of Fermionic ${}^{23}$Na${}^{40}$K Molecules in their Absolute Ground State
• Bose-Fermi Mixtures in a Three-dimensional Optical Lattice
• Repulsive Fermi polarons in a resonant mixture of ultracold ${}^6$Li atoms
• Quantum degenerate two-species Fermi-Fermi mixture coexisting with a Bose-Einstein condensate
• Ultracold Heteronuclear Fermi-Fermi Molecules
• Tuning of heteronuclear interactions in a quantum-degenerate Fermi-Bose mixture
• Role of interactions in 87Rb-40K Bose-Fermi mixtures in a 3d optical lattice
• Control of the interaction in a Fermi-Bose mixture
• Two-Element Mixture of Bose and Fermi Superfluids
• Cooling and thermometry of atomic Fermi gases
• Soliton trains in Bose-Fermi mixtures
• Formation of ultracold LiCs molecules
• Phase separation and collapse in Bose-Fermi mixtures with a Feshbach resonance
• Bose-Fermi mixtures in an optical lattice
• Universality of weakly bound dimers and Efimov trimers close to Li-Cs Feshbach resonances
• Mobile magnetic impurities in a Fermi superfluid: a route to designer molecules

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