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arXiv 0811.4456cond-mat.other
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$^7$ Li玻色-爱因斯坦凝聚体中相互作用的极端可调性

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

Scott E. Pollack, D. Dries, M. Junker, Y. P. Chen, T. A. Corcovilos, R. G. Hulet

摘要:

我们利用费什巴赫共振来调谐7Li的玻色-爱因斯坦凝聚体在|F = 1,m_F = 1>状态。使用的空间范围内的被困的凝聚,我们提取了一个跨越7个十年的范围内,从小的吸引力相互作用,以极强的排斥力相互作用。机翼上的费什巴赫共振的浅零交叉使得能够确定小到0.01玻尔半径的α。在此制度下,弱各向异性磁偶极相互作用的证据,通过比较不同的陷阱几何形状。

英文摘要:

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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