On the single mode approximation in spinor-1 atomic condensate

Details On the single mode approximation in spinor-1 atomic condensate On the single mode approximation in spinor-1 atomic condensate

2002-01-11

arxiv.org/abs/cond-mat/0201173v2

Physics

Condensed Matter

Superconductivity

Revised, newly found analytic proof added

Scientific paper

10.1103/PhysRevA.66.011601

We investigate the validity conditions of the single mode approximation (SMA) in spinor-1 atomic condensate when effects due to residual magnetic fields are negligible. For atomic interactions of the ferromagnetic type, the SMA is shown to be exact, with a mode function different from what is commonly used. However, the quantitative deviation is small under current experimental conditions (for $^{87}$Rb atoms). For anti-ferromagnetic interactions, we find that the SMA becomes invalid in general. The differences among the mean field mode functions for the three spin components are shown to depend strongly on the system magnetization. Our results can be important for studies of beyond mean field quantum correlations, such as fragmentation, spin squeezing, and multi-partite entanglement.

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