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arXiv 2012.09316cond-mat.quant-gas
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高密度玻色-爱因斯坦凝聚体在时变非谐势阱中的孤子动力学

Soliton dynamics of a high-density Bose-Einstein condensate subject to a time varying anharmonic trap

R. Flores-Calderón, J. Fujioka, A. Espinosa-Cerón

摘要:

本文研究了高密度玻色-爱因斯坦凝聚体(BEC)在时间振荡势阱中的孤子动力学。BEC的行为描述与修改的Gross-Pitaevskii方程(mGPE),考虑到三体损失,原子喂养和量子涨落(到一个新的高密度项)。采用变分近似方法研究了高斯脉冲在静态双势阱中的行为。直接数值解的mGPE证实,脉冲的中心表现出振荡行为(VA预测),并显示出一种新的现象的碎片和再生(FR)。结果表明,如果我们考虑一个潜在的时间依赖的二次项,这个FR过程被破坏,但FR生存,如果时间依赖引入一个立方项。当脉冲的振荡保持在其中一个势井中时,VA与数值解之间的比较显示出良好的一致性。研究了量子涨落项对FR过程的影响。最后,使用超高斯试验函数的变分结果。

英文摘要:

In this paper we study the soliton dynamics of a high-density Bose-Einstein condensate (BEC) subject to a time-oscillating trap. The behavior of the BEC is described with a modified Gross-Pitaevskii equation (mGPE) which takes into account three-body losses, atomic feeding and quantum fluctuations (up to a novel high-density term). A variational approximation (VA) is used to study the behavior of a Gaussian pulse in a static double-well potential. Direct numerical solutions of the mGPE corroborate that the center of the pulse exhibits an oscillatory behavior (as the VA predicts), and show a novel phenomenon of fragmentation and regeneration (FR). It is shown that this FR process is destroyed if we consider a potential with a time-dependent quadratic term, but the FR survives if the time dependence is introduced in a cubic term. Comparison between the VA and the numerical solution revealed an excellent agreement when the oscillations of the pulse remain in one of the potential wells. The effects of the quantum fluctuating terms on the FR process are studied. Finally, variational results using a supergaussian trial function are obtained.

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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