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Extreme Tunability of Interactions in a Li 7 Bose-Einstein Condensate

2009; American Physical Society; Volume: 102; Issue: 9 Linguagem: Inglês

10.1103/physrevlett.102.090402

1092-0145

S. E. Pollack, D. Dries, M. Junker, Y. P. Chen, Theodore A. Corcovilos, Randall G. Hulet,

Physics of Superconductivity and Magnetism

We use a Feshbach resonance to tune the scattering length a of a Bose-Einstein condensate of 7Li in the |F = 1, m_F = 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. In this regime, evidence of the weak anisotropic magnetic dipole interaction is obtained by comparison with different trap geometries.