arXiv 1403.01412014-03cond-mat.quant-gas

猝灭玻色气体中的平衡动力学：表征多个时间区域

Equilibrating dynamics in quenched Bose gases: characterizing multiple time regimes

A. Rancon, K. Levin

备注：: v2: major rewriting, 6 pages, 3 figures
发表信息：: Phys. Rev. A 90, 021602(R) (2014)
DOI：: 10.1103/PhysRevA.90.021602

摘要：

我们解决的物理平衡在超冷原子气体的相互作用参数淬火后。我们专注于动量分布的激发，$n_{\mathbf k}$，并观察到较大的${\mathbf k}$模式将更快地平衡，已声称在最近的实验工作。我们确定了三个时间制度。在短时间内，$n_{\mathbf k}$表现出振荡;这些振荡在中间时间衰减，此时系统似乎处于假平衡状态。最后，在较长的时间内，发生完全平衡。这种假平衡与冷凝物必然较慢的弛豫有关，然后将准弛豫地跟随足够高的（激发响应的）${\mathbf k}$ -态。我们的工作是对近年来有关相互作用猝灭实验的研究工作的补充。我们对迄今为止的理论假设振荡状态足以解决实验这一事实提出异议。

英文摘要：

We address the physics of equilibration in ultracold atomic gases following a quench of the interaction parameter. We focus on the momentum distribution of the excitations, $n_{\mathbf k}$, and observe that larger ${\mathbf k}$ modes will equilibrate faster, as has been claimed in recent experimental work. We identify three time regimes. At short times $n_{\mathbf k}$ exhibits oscillations; these are damped out at intermediate times where the system appears to be in a false-equilibrium. Finally, at longer times, full equilibration occurs. This false-equilibrium is associated with the necessarily slower relaxation of the condensate which sufficiently high ${\mathbf k}$-states (of the excitation response) will then quasi-adiabatically follow. Our work bears on the recent literature focus on interaction quench experiments. We take issue with the fact that theories to date assume that the oscillatory regime is adequate for addressing experiments.

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英文摘要：

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