Driving Bose-Einstein-Condensate vorticity with a rotating normal cloud

被引：309

作者：

Haljan, PC ^{[1
]}

Coddington, I

Engels, P

Cornell, EA

机构：

[1] Univ Colorado, Natl Inst Stand & Technol, JILA, Boulder, CO 80309 USA

[2] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.87.210403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have developed an evaporative cooling technique that accelerates the rotation of an ultracold Rb-87 gas, confined in a static harmonic potential. As a normal gas is evaporatively spun up and cooled below quantum degeneracy, it is found to nucleate vorticity in a Bose-Einstein condensate. Measurements of the condensate's aspect ratio and surface-wave excitations are consistent with effective rigid-body rotation. Rotation rates of up to 94% of the centrifugal limit are inferred. A threshold in the normal cloud's rotation is observed for the intrinsic nucleation of the first vortex. The threshold value lies below the prediction for a nucleation mechanism involving the excitation of surface waves of the condensate.

引用

页码：210403 / 1

页数：4

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