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Impact of Quantum Fluctuations on the Modulational Instability of a Modified Gross-Pitaevskii Equation with Two-Body Interaction

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DOI: 10.4236/am.2012.38125    4,318 Downloads   7,035 Views   Citations


Modulational instability conditions for the generation of localized structures in the context of matter waves in Bose-Einstein condensates are investigated analytically and numerically. The model is based on a modified Gross-Pitaevskii equation, which account for the energy dependence of the two-body scattering amplitude. It is shown that the modified term due to the quantum fluctuations modify significantly the modulational instability gain. Direct numerical simulations of the full modified Gross-Pitaevskii equation are performed, and it is found that the modulated plane wave evolves into a train of pulses, which is destroyed at longer times due to the effects of quantum fluctuations.

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C. Tiofack, T. Ekogo, H. Moussambi, A. Mohamadou and T. Kofane, "Impact of Quantum Fluctuations on the Modulational Instability of a Modified Gross-Pitaevskii Equation with Two-Body Interaction," Applied Mathematics, Vol. 3 No. 8, 2012, pp. 844-850. doi: 10.4236/am.2012.38125.


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