Expansion of a lithium gas in the BEC-BCS crossover
Abstract
We report on experiments in 6Li Fermi gases near Feshbach resonances. A broad s-wave resonance is used to form a Bose-Einstein condensate of weakly bound 6Li2 molecules in a crossed optical trap. The measured molecule-molecule scattering length of 170+100-60 nm at 770 G is found in good agreement with theory. The expansion energy of the cloud in the BEC-BCS crossover region is measured. Finally we discuss the properties of p-wave Feshbach resonances observed near 200 Gauss and new s-wave resonances in the heteronuclear 6Li- 7Li mixture.
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