Two-point density correlations of quasicondensates in free expansion

Details Two-point density correlations of quasicondensates in free expansion Two-point density correlations of quasicondensates in free expansion

2009-11-12

arxiv.org/abs/0911.2376v2

Phys. Rev. A 81, 031610(R) (2010)

Physics

Condensed Matter

Quantum Gases

4 pages, 4 figures, minor changes

Scientific paper

10.1103/PhysRevA.81.031610

We measure the two-point density correlation function of freely expanding quasicondensates in the weakly interacting quasi-one-dimensional (1D) regime. While initially suppressed in the trap, density fluctuations emerge gradually during expansion as a result of initial phase fluctuations present in the trapped quasicondensate. Asymptotically, they are governed by the thermal coherence length of the system. Our measurements take place in an intermediate regime where density correlations are related to near-field diffraction effects and anomalous correlations play an important role. Comparison with a recent theoretical approach described by Imambekov et al. yields good agreement with our experimental results and shows that density correlations can be used for thermometry of quasicondensates.

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