Bose-Einstein condensation in a stiff TOP trap with adjustable geometry

Details Bose-Einstein condensation in a stiff TOP trap with adjustable geometry Bose-Einstein condensation in a stiff TOP trap with adjustable geometry

2000-04-03

arxiv.org/abs/cond-mat/0004015v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures

Scientific paper

10.1088/0953-4075/33/19/319

We report on the realisation of a stiff magnetic trap with independently adjustable trap frequencies, $\omega_z$ and $\omega_r$, in the axial and radial directions respectively. This has been achieved by applying an axial modulation to a Time-averaged Orbiting Potential (TOP) trap. The frequency ratio of the trap, $\omega_z / \omega_r$, can be decreased continuously from the original TOP trap value of 2.83 down to 1.6. We have transferred a Bose-Einstein condensate (BEC) into this trap and obtained very good agreement between its observed anisotropic expansion and the hydrodynamic predictions. Our method can be extended to obtain a spherical trapping potential, which has a geometry of particular theoretical interest.

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