Experimental study of the BEC-BCS crossover region in lithium 6.
We report Bose-Einstein condensation of weakly bound 6Li2 molecules in a crossed optical trap near a Feshbach resonance. We measure a molecule-molecule scattering length of 170(+100)(-60) nm at 770 G, in good agreement with theory. We study the 2D expansion of the cloud and show deviation from hydrodynamic behavior in the BEC-BCS crossover region.
Laboratoire Kastler-Brossel, ENS, 24 rue Lhomond, 75005 Paris.
T
T
Bourdel
L
L
Khaykovich
J
J
Cubizolles
J
J
Zhang
F
F
Chevy
M
M
Teichmann
L
L
Tarruell
S J J M F
SJ
Kokkelmans
C
C
Salomon