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arXiv 1206.0920cond-mat.quant-gasnlin.CDquant-ph
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玻色-爱因斯坦凝聚体Bogoliubov激发的非线性动力学研究

A nonlinear dynamics approach to Bogoliubov excitations of Bose-Einstein condensates

M. Kreibich, H. Cartarius, J. Main, G. Wunner

摘要:

我们假设玻色-爱因斯坦凝聚体的宏观波函数为高斯波包的叠加,复宽度参数随时间变化,将其插入到对应于Gross-Pitaevskii方程(GPE)的平均场能量泛函中,并应用含时变分原理.这样,GPE被映射到一个系统的耦合运动方程的复杂的宽度参数,可以使用非线性动力学的方法进行分析。我们进行了非线性系统的不动点的稳定性分析,并证明了雅可比矩阵的特征值再现了轴对称陷阱中凝聚体的低量子力学Bogoliubov激发谱。

英文摘要:

We assume the macroscopic wave function of a Bose-Einstein condensate as a superposition of Gaussian wave packets, with time-dependent complex width parameters, insert it into the mean-field energy functional corresponding to the Gross-Pitaevskii equation (GPE) and apply the time-dependent variational principle. In this way the GPE is mapped onto a system of coupled equations of motion for the complex width parameters, which can be analyzed using the methods of nonlinear dynamics. We perform a stability analysis of the fixed points of the nonlinear system, and demonstrate that the eigenvalues of the Jacobian reproduce the low-lying quantum mechanical Bogoliubov excitation spectrum of a condensate in an axisymmetric trap.

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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