Partial delocalization of two-component condensates in optical lattices

Abstract

We study management of localized modes in two-component (spinor) Bose-Einstein condensates embedded in optical lattices by changing interspecies interactions. By numerical integration of the coupled Gross-Pitaevskii equations, we find three different regimes of the delocalizing transition: i) the partial delocalization when the chemical potential of one of the components collapses with a gap edge and the respective component transforms into a Bloch state, while the other component remains localized; ii) the partial delocalization as consequence of instability of one of the components; and iii) the situation where the vector soliton reaches limits of the existence domain. It is shown that there exists a critical value for interspecies scattering length, below which solutions can be manipulated and above which one of the components is irreversibly destroyed.

8 pages, 5 figures

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• Solitons supported by localized nonlinearities in periodic media
• Solitary waves in coupled nonlinear Schrodinger equations with spatially inhomogeneous nonlinearities
• Arrayed and checkerboard optical waveguides controlled by the electromagnetically-induced transparency
• Solitons supported by spatially inhomogeneous nonlinear losses
• Transfer and scattering of wave packets by a nonlinear trap