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
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.
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页码:210403 / 1
页数:4
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