Expansion of a lithium gas in the BEC-BCS crossover

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 170-60+100{expression} nm at 770 G is found in good...

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Bibliographic Details
Published in:AIP conference proceedings 2005-05, Vol.770 (1), p.228-237
Main Authors: Zhang, J, van Kempen, E G M, Bourdel, T, Khaykovich, L, Cubizolles, J, Chevy, F, Teichmann, M, Tarruell, L, Kokkelman, SJJMF, Salomon, C
Format: Article
Language:English
Subjects:
ATOM-ATOM COLLISIONS
ATOMIC AND MOLECULAR PHYSICS
BCS THEORY
BOSE-EINSTEIN CONDENSATION
EXPANSION
FERMI GAS
LITHIUM
LITHIUM 6
LITHIUM 7
MIXTURES
MOLECULE-MOLECULE COLLISIONS
P WAVES
RESONANCE
S WAVES
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Summary: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 170-60+100{expression} 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.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.1928857