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Two-point density correlations of quasi-condensates in free expansion | | S. Manz
; R. Bücker
; T. Betz
; Ch. Koller
; S. Hofferberth
; I. E. Mazets
; A. Imambekov
; E. Demler
; A. Perrin
; J. Schmiedmayer
; T. Schumm
; | | Date: |
12 Nov 2009 | | Abstract: | We measure the two-point density correlation function of freely expanding
quasi-condensates in the weakly interacting quasi-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
quasi-condensate. 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 quasi-condensates. | | Source: | arXiv, 0911.2376 | | Services: | Forum | Review | PDF | Favorites | |
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