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arXiv 1412.4147nlin.PScond-mat.quant-gas
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多暗和多暗-亮孤子原子云中有序到无序的转变

Transitions From Order to Disorder in Multi-Dark and Multi-Dark-Bright Soliton Atomic Clouds

Wenlong Wang, P. G. Kevrekidis

摘要:

我们已经进行了一个系统的研究量化的孤波行为的变化,从一个有序的云类似的“结晶”配置的无序状态,可以被描述为一个孤立子“气体”。作为我们的说明性的例子,我们使用单组分,以及两个组件,一维原子气体非常接近零温度,在排斥原子间的相互作用和抛物线陷阱的存在下,云,分别暗(暗亮)孤子可以形成在一(二)组件系统。我们通过三种不同类型的方法,即Gross-Pitaevskii类型的偏微分方程,基于粒子的常微分方程描述的孤子动力学系统和蒙特卡罗模拟的粒子系统证实了我们的研究结果。我们定义了一个“经验”序参量来表征孤子晶格的序,并研究了它如何作为“热”强度的函数而变化(即,动力学)引起的扰动。正如我们系统的一维性质所预期的那样,从有序到无序的转变是渐进的,显然在中间状态中没有真正的相变。

英文摘要:

We have performed a systematic study quantifying the variation of solitary wave behavior from that of an ordered cloud resembling a "crystalline" configuration to that of a disordered state that can be characterized as a soliton "gas". As our illustrative examples, we use both one-component, as well as two-component, one dimensional atomic gases very close to zero temperature, where in the presence of repulsive inter-atomic interactions and of a parabolic trap, a cloud, respectively of dark (dark-bright) solitons can form in the one- (two-) component system. We corroborate our findings through three distinct types of approaches, namely a Gross-Pitaevskii type of partial differential equation, particle-based ordinary differential equations describing the soliton dynamical system and Monte-Carlo simulations for the particle system. We define an "empirical" order parameter to characterize the order of the soliton lattices and study how this changes as a function of the strength of the "thermally" (i.e., kinetically) induced perturbations. As may be anticipated by the one-dimensional nature of our system, the transition from order to disorder is gradual without, apparently, a genuine phase transition ensuing in the intermediate regime.

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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