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arXiv 1507.04025math-phmath.MP
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多势阱非线性Schrodinger方程的Stark型微扰

Nonlinear Schrodinger equations with a multiple-well potential and a Stark-type perturbation

Andrea Sacchetti

摘要:

本文用Gross-Pitaevskii方程描述了在均匀外场作用下的一维格子中的玻色-爱因斯坦凝聚体(BEC)。在这里,我们证明了这样的方程可以减少,在半经典极限和有限数量的井的晶格的情况下,有限维离散非线性薛定谔方程。然后,通过数值实验,我们表明,BEC的质心表现出调制振幅的振荡行为,特别是,我们表明,振荡周期实际上取决于初始的凝聚波函数的形状以及非线性项的强度。这一事实提出了一个关于通过测量振荡周期来确定引力常量的方法是否有效的问题。

英文摘要:

A Bose-Einstein condensate (BEC) confined in a one-dimensional lattice under the effect of an external homogeneous field is described by the Gross-Pitaevskii equation. Here we prove that such an equation can be reduced, in the semiclassical limit and in the case of a lattice with a finite number of wells, to a finite-dimensional discrete nonlinear Schrodinger equation. Then, by means of numerical experiments we show that the BEC's center of mass exhibits an oscillating behavior with modulated amplitude; in particular, we show that the oscillating period actually depends on the shape of the initial wavefunction of the condensate as well as on the strength of the nonlinear term. This fact opens a question concerning the validity of a method proposed for the determination of the gravitational constant by means of the measurement of the oscillating period.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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