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

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

Mar, 2009

4 pages

Published in:

Phys.Rev.Lett. 102 (2009) 090402

e-Print:

0811.4456 [cond-mat.other]

DOI:

10.1103/PhysRevLett.102.090402

View in:

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Abstract: (arXiv)

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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Figures(5)

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