Expansion of a lithium gas in the BEC-BCS crossover

C. Salomon (LKB - Lhomond); E.G.M. van Kempen; F. Chevy (LKB - Lhomond); J. Cubizolles (LKB - Lhomond); J. Zhang; L. Khaykovich; L. Tarruell (LKB - Lhomond); M. Teichmann (LKB - Lhomond); S.J.J.M.F. Kokkelmans; T. Bourdel (LKB - Lhomond)

arxiv: cond-mat/0410167 · v1 · submitted 2004-10-07 · ❄️ cond-mat.stat-mech

Expansion of a lithium gas in the BEC-BCS crossover

J. Zhang , E.G.M. van Kempen , T. Bourdel (LKB - Lhomond) , L. Khaykovich , J. Cubizolles (LKB - Lhomond) , F. Chevy (LKB - Lhomond) , M. Teichmann (LKB - Lhomond) , L. Tarruell (LKB - Lhomond)

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S.J.J.M.F. Kokkelmans C. Salomon (LKB - Lhomond)

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classification ❄️ cond-mat.stat-mech

keywords resonancesbec-bcscrossoverexpansionfeshbachmeasurednears-wave

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We report on experiments in $^6$Li Fermi gases near Feshbach resonances. A broad s-wave resonance is used to form a Bose-Einstein condensate of weakly bound $^6$Li$_2$ 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 $^6$Li- $^7$Li mixture.

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Expansion of a lithium gas in the BEC-BCS crossover

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