Density Modulations in an Elongated BEC Released from a Disordered Potential
Résumé
We observe large density modulations in time-of-flight images of elongated Bose-Einstein condensates, initially confined in a harmonic trap and in the presence of weak disorder. The development of these modulations during the time-of-flight and their dependence with the disorder are investigated. We render an account of this effect using numerical and analytical calculations. Our analysis shows how the observed large modulations originate from the weak initial density modulations induced by the disorder, and do not require phase fluctuations (thermal or quantum) in the initial condensate.
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