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Dimensional reduction and localization of a Bose-Einstein condensate in a quasi-1D bichromatic optical lattice

We analyze the localization of a Bose-Einstein condensate (BEC) in a one-dimensional bichromatic quasi-periodic optical-lattice potential by numerically solving the 1D Gross-Pitaevskii equation (1D GPE). We first derive the 1D GPE from the dimensional reduction of the 3D quantum field theory of interacting bosons obtaining two coupled differential equations (for axial wavefuction and space-time dependent transverse width) which reduce to the 1D GPE under strict conditions. Then, by using the 1D GPE we report the suppression of localization in the interacting BEC when the repulsive scattering length between bosonic atoms is sufficiently large.

preprint2016arXivOpen access
L. SalasnichS. K. Adhikari
nlin.PScond-mat.quant-gas
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L. SalasnichS. K. Adhikari

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