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), S.J.J.M.F., Kokkelmans, C. Salomon (LKB - Lhomond)
TL;DR
This paper explores the behavior of lithium gases near Feshbach resonances, demonstrating Bose-Einstein condensation, measuring scattering lengths, and analyzing expansion energies across the BEC-BCS crossover, including p-wave and heteronuclear resonances.
Contribution
It provides experimental measurements of scattering lengths and expansion energies in lithium gases, and reports new observations of p-wave and heteronuclear Feshbach resonances.
Findings
Measured molecule-molecule scattering length of 170 nm at 770 G
Observed expansion energy variations in the BEC-BCS crossover
Detected p-wave and heteronuclear Feshbach resonances
Abstract
We report on experiments in Li Fermi gases near Feshbach resonances. A broad s-wave resonance is used to form a Bose-Einstein condensate of weakly bound Li molecules in a crossed optical trap. The measured molecule-molecule scattering length of 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 Li- Li mixture.
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