Effects of Atom-Atom Interaction on Localization and Adiabaticity of BEC in One-Dimensional Disorder Optical Lattice
Effects of Atom-Atom Interaction on Localization and Adiabaticity of BEC in One-Dimensional Disorder Optical Lattice
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DOI：
10.1088/0256-307x/26/9/090303
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发表时间：
2009-09
影响因子：
3.5
通讯作者：
X. Zhen;Duan Ya-Fan;Zhou Shu-yu;Hong-shuai Tao;Wang Yu-zhu
中科院分区：
文献类型：
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作者：
X. Zhen;Duan Ya-Fan;Zhou Shu-yu;Hong-shuai Tao;Wang Yu-zhu
本文采用分步傅里叶方法，在含时的一维Gross-Pitaevskii方程下，数值模拟了一维不可压缩光晶格中BEC的动力学行为。结果表明，无论是单晶格还是无公度晶格，原子-原子相互作用都会削弱局域化，加宽波函数，并由于加宽效应破坏斜坡加载过程的绝热性。带结构模型可以解释这些光学晶格中绝热条件与非相互作用BEC的差异。
We numerically simulate the dynamical behavior of BEC in one-dimensional incommensurable optical lattice by split-step Fourier method in a time-dependent one-dimensional Gross—Pitaevskii equation. It is indicated that the atom-atom interaction will weaken the localization and broaden the wave function, and it will destroy the adiabaticity of the ramped loading process in both single lattice and incommensurate lattice due to the broadening effect. A band structure model can interpret the difference of the adiabatic condition with non-interacting BEC in these optical lattices.