Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-08-28
Physics
Condensed Matter
Other Condensed Matter
8 figures
Scientific paper
10.1016/j.physd.2008.02.017
Considering the Gross-Pitaevskii integral equation we are able to formally obtain an analytical solution for the order parameter $\Phi (x)$ and for the chemical potential $\mu $ as a function of a unique dimensionless non-linear parameter $\Lambda $. We report solutions for different range of values for the repulsive and the attractive non-linear interactions in the condensate. Also, we study a bright soliton-like variational solution for the order parameter for positive and negative values of $\Lambda $. Introducing an accumulated error function we have performed a quantitative analysis with other well-established methods as: the perturbation theory, the Thomas-Fermi approximation, and the numerical solution. This study gives a very useful result establishing the universal range of the $\Lambda $-values where each solution can be easily implemented. In particular we showed that for $\Lambda <-9$, the bright soliton function reproduces the exact solution of GPE wave function.
Birman Joseph L.
Drake-Perez Julio C.
Lopez-Richard V.
Trallero-Giner Carlos
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