Extreme tunability of interactions in a $^7$Li Bose-Einstein condensate

Details Extreme tunability of interactions in a $^7$Li Bose-Einstein condensate Extreme tunability of interactions in a $^7$Li Bose-Einstein condensate

2008-11-27

arxiv.org/abs/0811.4456v2

Phys.Rev.Lett.102:090402,2009

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevLett.102.090402

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.

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