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arXiv 2007.08168cond-mat.stat-mech
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一维静态浴中的驱动示踪剂动力学

Driven tracer dynamics in a one dimensional quiescent bath

Asaf Miron, David Mukamel

摘要:

受几何约束的静态浴中的受驱动示踪剂的动力学有效地模拟了广泛的现象。我们探索这种动态在一个一维晶格模型,几何约束是通过不同的粒子超越率调整。以前的研究模型的固定性能环上的$L$网站揭示了一个阶段,其中浴密度分布延伸超过$\sim \mathcal{O}(L)$距离的示踪剂和示踪剂的速度消失为$\sim 1/L$。在这里,我们研究模型的动力学在这个阶段作为$L\rightarrow \infty$和长时间。我们表明,浴密度分布演变的$\sim \sqrt{t}$时间尺度上,相应地,示踪剂的速度衰减为$\sim 1/\sqrt{t}$。不像充分研究的非驱动示踪剂,其动态变得扩散时,超车是允许的,我们在这里发现,驾驶示踪剂保留其标志性的子扩散单列动态,即使在超车的存在。

英文摘要:

The dynamics of a driven tracer in a quiescent bath subject to geometric confinement effectively models a broad range of phenomena. We explore this dynamics in a 1D lattice model where geometric confinement is tuned by varying particle overtaking rates. Previous studies of the model's stationary properties on a ring of $L$ sites have revealed a phase in which the bath density profile extends over an $\sim \mathcal{O}(L)$ distance from the tracer and the tracer's velocity vanishes as $\sim 1/L$. Here, we study the model's dynamics in this phase as $L\rightarrow \infty$ and for long times. We show that the bath density profile evolves on a $\sim \sqrt{t}$ time-scale and, correspondingly, that the tracer's velocity decays as $\sim 1/\sqrt{t}$. Unlike the well-studied non-driven tracer, whose dynamics becomes diffusive whenever overtaking is allowed, we here find that driving the tracer preserves its hallmark sub-diffusive single-file dynamics, even in the presence of overtaking.

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