Reaching the hydrodynamic regime in a Bose-Einstein condensate by suppression of avalanche

Details Reaching the hydrodynamic regime in a Bose-Einstein condensate by suppression of avalanche Reaching the hydrodynamic regime in a Bose-Einstein condensate by suppression of avalanche

2006-09-07

arxiv.org/abs/cond-mat/0609172v1

Physics

Condensed Matter

Other Condensed Matter

Article submitted for Phys. Rev. Letters, 6 figures

Scientific paper

We report the realization of a Bose-Einstein condensate (BEC) in the hydrodynamic regime. The hydrodynamic regime is reached by evaporative cooling at a relative low density suppressing the effect of avalanches. With the suppression of avalanches a BEC containing 120.10^6 atoms is produced. The collisional opacity can be tuned from the collisionless regime to a collisional opacity of more than 3 by compressing the trap after condensation. In the collisional opaque regime a significant heating of the cloud at time scales shorter than half of the radial trap period is measured. This is direct proof that the BEC is hydrodynamic.

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