反常核软化流体中的活性与竞争长度尺度
Activity and Competing Length Scales in an Anomalous Core-Softened Fluid
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中文总结 AI 辅助
研究活性布朗粒子在反常核软化势下，通过沿等温线改变活性，利用迭代玻尔兹曼反演构建有效相互作用，发现活性抑制流体反常，促进粒子在特征长度尺度间转移，减少结构竞争。
中文摘要 AI 辅助
活性与竞争相互作用长度尺度之间的相互作用在很大程度上仍未得到探索，尽管它与许多软物质和生物系统相关。本文研究了通过类似斜坡的核软化势相互作用的活性布朗粒子，该势在平衡时表现出水样反常。通过沿两条代表性等温线在广泛的密度范围内改变活性，一条在反常区域内，另一条在其上方，研究自推进如何改变流体的结构和动力学。为深入了解这些变化，利用迭代玻尔兹曼反演从稳态对关联构建有效相互作用。发现活性逐渐抑制被动流体的反常，尽管在归一化量中潜在结构转变的特征仍然可见。有效相互作用表明自推进降低了局部环境之间的差异，并促进了两个特征长度尺度之间的粒子转移。这些结果表明，活性主要通过促进两个局部环境之间的粒子转移起作用，从而减少导致反常响应的结构竞争。
英文摘要
The interplay between activity and competing interaction length scales remains largely unexplored, despite its relevance to many soft and biological systems. Here, we study Active Brownian Particles interacting through a ramp-like core-softened potential that exhibits water-like anomalies in equilibrium. By varying the activity over a broad range of densities along two representative isotherms, one within the anomalous region and the other above it, we examine how self-propulsion modifies the structure and dynamics of the fluid. To gain microscopic insight into these changes, we construct effective interactions from the steady-state pair correlations using iterative Boltzmann inversion. We find that activity progressively suppresses the anomalies of the passive fluid, although signatures of the underlying structural crossover remain visible in normalized quantities. The effective interactions reveal that self-propulsion lowers the distinction between the local environments and facilitates population transfer between the two characteristic length scales. These results indicate that activity primarily acts by facilitating population transfer between the two local environments, thereby reducing the structural competition responsible for the anomalous response.
