Extreme tunability of interactions in a 7Li Bose-Einstein condensate.
We use a Feshbach resonance to tune the scattering length a of a Bose-Einstein condensate of 7Li in the |F=1,mF=1> state. Using the spatial extent of the trapped condensate, we extract a over a range spanning 7 decades from small attractive interactions to extremely strong repulsive interactions. The shallow zero crossing in the wing of the Feshbach resonance enables the determination of a as small as 0.01 Bohr radii. Evidence of the weak anisotropic magnetic dipole interaction is obtained by comparison with different trap geometries for small a.
Pollack
S E
SE
Department of Physics and Astronomy and Rice Quantum Institute, Rice University, Houston, Texas 77005, USA.
Dries
D
D
Junker
M
M
Chen
Y P
YP
Corcovilos
T A
TA
Hulet
R G
RG