Localization of a Bose-Einstein condensate in a bichromatic optical lattice
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American Physical Society (APS)
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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.
