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Density ripples in expanding low-dimensional gases as a probe of correlations

Imambekov, A. ; Mazets, I. E. ; Petrov, D. S. ; Gritsev, Vladimir ; Manz, S. ; Hofferberth, S. ; Schumm, T. ; Demler, Eugene ; Schmiedmayer, J.

In: Physical Review A, 2009, vol. 80, p. 033604

We investigate theoretically the evolution of the two-point density correlation function of a low-dimensional ultracold Bose gas after release from a tight transverse confinement. In the course of expansion thermal and quantum fluctuations present in the trapped systems transform into density fluctuations. For the case of free ballistic expansion relevant to current experiments, we present simple...