Strongly interacting isotopic Bose-Fermi mixture immersed in a Fermi sea
2011
We have created a triply quantum-degenerate mixture of bosonic {sup 41}K and two fermionic species {sup 40}K and {sup 6}Li. The boson is shown to be an efficient coolant for the two fermions, spurring hopes for the observation of fermionic superfluids with imbalanced masses. We observe multiple heteronuclear Feshbach resonances, in particular a wide s-wave resonance for the combination {sup 41}K-{sup 40}K, opening up studies of strongly interacting isotopic Bose-Fermi mixtures. For large imbalance in the local densities of different species, we enter the polaronic regime of dressed impurities immersed in a bosonic or fermionic bath.
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