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arXiv · 1603.07486

Attraction-induced dynamical stability of a Bose-Einstein condensate in a nonlinear lattice

Raka Dasgupta·B. Prasanna Venkatesh·Gentaro Watanabe
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Abstract

We study multiple-period Bloch states of a Bose-Einstein condensate with spatially periodic interactomic interaction. Solving the Gross-Pitaevskii equation for the continuum model, and also using a simplified discrete version of it, we investigate the energy-band structures and the corresponding stability properties. We observe a new "attraction-induced dynamical stability" mechanism caused by the localization of the density distribution in the attractive domains of the system and the isolation of these higher-density regions. This makes the superfluid stable near the zone boundary, and also enhances the stability of higher-periodic states if the nonlinear interaction strength is sufficiently high.

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Raka Dasgupta, B. Prasanna Venkatesh, Gentaro Watanabe. 2016-03-24. Attraction-induced dynamical stability of a Bose-Einstein condensate in a nonlinear lattice. https://doi.org/10.1103/physreva.93.063618

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