论文标题
热活动性布朗颗粒的相干运动
The coherent motions of thermal active Brownian particles
论文作者
论文摘要
活性物质表现出许多有趣的非平衡特征,\ emph {e.g。},没有任何有吸引力且对齐的相互作用的活性布朗颗粒(ABP)可能会发生流动性引起的相变,以形成一些密集的结构域,并具有结构性顺序和动态连贯性。最近,在Athermal ABP系统中发现了密集和有序簇中颗粒之间的速度相关性,但是,如果包括用于描述显微镜ABP的热噪声,对ABP中结构和动力学之间的一致性产生了一些混乱,这似乎会消失。在这里,我们证明,热噪声对ABP的瞬时速度施加了一个大的随机术语,阻碍了ABP运动中(小)相关性的观察。通过在各个滞后时间中平均瞬时速度(或等效地计算位移),我们表明,在一个小的数量级中,热裂开的ABP的运动小于翻译特征时间高度相干,并且在空间上与ABP的结构顺序保持在空间上。
Active matter exhibits many intriguing non-equilibrium character, \emph{e.g.}, the active Brownian particles (ABP) without any attractive and aligned interactions can occur the mobility-induced phase transition to form some dense domains with both the structural ordering and dynamical coherence. Recently, the velocity correlation among the particles in the dense and ordered clusters was found in athermal ABP systems, however, seemed to disappear if including the thermal noises to describe microscopic ABPs, bringing some confusion about the generality of the consistence between structure and dynamics in ABPs. Here we demonstrate that the thermal noises imposing a large random term on the instantaneous velocity of ABPs hinder the observation of the (small) correlation in motions of ABPs. By averaging the instantaneous velocity (or equivalently, calculating the displacement) in various lag times, we show that the motions of thermal-fluctuated ABPs in the one order of magnitude smaller than the translational characteristic time are highly coherent and consistent spatially with the structural ordering of the ABPs.