Abstract
We find that in very elongated 3D trapped Bose gases, even at temperatures far below the BEC transition temperature , the equilibrium state will be a 3D condensate with fluctuating phase (quasicondensate). At sufficiently low temperatures the phase fluctuations are suppressed and the quasicondensate turns into a true condensate. The presence of the phase fluctuations allows for extending thermometry of Bose-condensed gases well below those established in current experiments.
- Received 20 April 2001
DOI:https://doi.org/10.1103/PhysRevLett.87.050404
©2001 American Physical Society