Coherence length of an elongated condensate: a study by matter-wave interferometry

Abstract

We measure the spatial correlation function of Bose-Einstein condensates in the cross-over region between phase-coherent and strongly phase-fluctuating condensates. We observe the continuous path from a gaussian-like shape to an exponential-like shape characteristic of one-dimensional phase-fluctuations. The width of the spatial correlation function as a function of the temperature shows that the condensate coherence length undergoes no sharp transition between these two regimes.

8 pages, 6 figure, submitted to EPJD

References in corpus (1)

• Observation of deviations from ideal gas thermodynamics in a trapped Bose-Einstein condensed gas

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