Journal article
Driving Bose-Einstein condensate vorticity with a rotating normal cloud
Physical review letters, Vol.87(21), pp.210403-1-210403-4
06/18/2001
Handle:
https://hdl.handle.net/2376/108261
PMID: 11736325
Abstract
Phys.Rev.Lett.87:210403,2001 We have developed an evaporative cooling technique that accelerates the
circulation of an ultra-cold $^{87}$Rb 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 ground-state condensate.
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Details
- Title
- Driving Bose-Einstein condensate vorticity with a rotating normal cloud
- Creators
- P. C HaljanI CoddingtonP EngelsE. A Cornell
- Publication Details
- Physical review letters, Vol.87(21), pp.210403-1-210403-4
- Academic Unit
- Physics and Astronomy, Department of
- Identifiers
- 99900546933101842
- Language
- English
- Resource Type
- Journal article