Localization of a Bose-Einstein condensate in a bichromatic optical lattice
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By direct numerical simulation of the time-dependent Gross-Pitaevskii equation, we study different aspects of the localization of a noninteracting ideal Bose-Einstein condensate (BEC) in a one-dimensional bichromatic quasiperiodic optical-lattice potential. Such a quasiperiodic potential, used in a recent experiment on the localization of a BEC, can be formed by the superposition of two standing-wave polarized laser beams with different wavelengths. We investigate the effect of the variation of optical amplitudes and wavelengths on the localization of a noninteracting BEC. We also simulate the nonlinear dynamics when a harmonically trapped BEC is suddenly released into a quasiperiodic potential, as done experimentally in a laser speckle potential. We finally study the destruction of the localization in an interacting BEC due to the repulsion generated by a positive scattering length between the bosonic atoms. © 2009 The American Physical Society.
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Bose-Einstein condensates, Bosonic atoms, Laser speckle, Non-linear dynamics, One-dimensional, Optical amplitudes, Optical lattices, Optical-lattice potential, Polarized laser beams, Quasi-periodic, Quasiperiodic potential, Scattering length, Time-dependent Gross-Pitaevskii equation, Bose-Einstein condensation, Computer simulation languages, Laser beams, Speckle, Steam condensers, Light transmission
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Inglês
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Physical Review A - Atomic, Molecular, and Optical Physics, v. 80, n. 2, 2009.
