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Self-induced density modulations in the free expansion of Bose-Einstein condensates | | L. Salasnich
; N. Manini
; F. Bonelli
; M. Korbman
; A. Parola
; | | Date: |
17 Jan 2007 | | Subject: | Other; Statistical Mechanics | | Abstract: | We simulate numerically the free expansion of a repulsive Bose-Einstein condensate with an initially Gaussian density profile. We find a self-similar expansion only for weak inter-atomic repulsion. In contrast, for strong repulsion we observe the spontaneous formation of a shock wave at the surface followed by a significant depletion inside the cloud. In the expansion, contrary to the case of a classical viscous gas, the quantum fluid can generate radial rarefaction density waves with several minima and maxima. These intriguing nonlinear effects, never observed yet in free-expansion experiments with ultra-cold alkali-metal atoms, can be detected with the available setups. | | Source: | arXiv, cond-mat/0701411 | | Services: | Forum | Review | PDF | Favorites | |
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