相干分裂准凝聚体中的失相
Dephasing in coherently-split quasicondensates
摘要：
我们数值模拟了一对相干分裂准凝聚体的演化。一个真正的一维的情况下，假设两个准凝聚体之间的（最初高）相干性的损失是由于失相，但不是由于违反可积性和随后的热化（这是从本模型中排除）。我们证实了S. Hofferberth { \em et. al.}，Nature { \bf 449}，324（2007）.发现特征时间$t_0$与准凝聚态线密度与温度之比的平方成比例，并分析了干涉衬度的全分布函数和相位相关的衰减。
英文摘要：
We numerically model the evolution of a pair of coherently split quasicondensates. A truly one-dimensional case is assumed, so that the loss of the (initially high) coherence between the two quasicondensates is due to dephasing only, but not due to the violation of integrability and subsequent thermalization (which are excluded from the present model). We confirm the subexponential time evolution of the coherence between two quasicondensates $\propto \exp [-(t/t_0)^{2/3}]$, experimentally observed by S. Hofferberth {\em et. al.}, Nature {\bf 449}, 324 (2007). The characteristic time $t_0$ is found to scale as the square of the ratio of the linear density of a quasicondensate to its temperature, and we analyze the full distribution function of the interference contrast and the decay of the phase correlation.
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