论文标题
晶格模型中主动和被动相分离的通用性
Universality of active and passive phase separation in a lattice model
论文作者
论文摘要
运动诱导的相分离（MIP）是活性颗粒的自发聚集，而平衡相分离（EPS）是由被动颗粒之间的吸引力相互作用在热力学上驱动的。尽管微观机制有如此差异，但MIPS和EP之间的相似性（如自由能结构和关键现象）已被讨论。在这里，我们介绍和分析了一个2D晶格气模型，该模型通过调整活性和相互作用参数来经历MIP和EPS。基于模拟和平均场理论，我们发现MIP和EPS临界点通过一个非平衡临界点线连接。根据域大小的物理量尺寸和时间演变的尺寸缩放，静态和动态临界指数似乎都与整个临界线上的2D自旋交换通用性一致。结果表明，活动有效地增强了粒子和叶之间的吸引人相互作用，完整的相位分离的临界特性。
The motility-induced phase separation (MIPS) is the spontaneous aggregation of active particles, while equilibrium phase separation (EPS) is thermodynamically driven by attractive interactions between passive particles. Despite such difference in the microscopic mechanism, similarities between MIPS and EPS like free energy structure and critical phenomena have been discussed. Here we introduce and analyze a 2D lattice gas model that undergoes both MIPS and EPS by tuning activity and interaction parameters. Based on simulations and mean-field theory, we find that the MIPS and EPS critical points are connected through a line of nonequilibrium critical points. According to the size scaling of physical quantities and time evolution of the domain size, both the static and dynamical critical exponents seem consistent with the 2D spin-exchange Ising universality over the whole critical line. The results suggest that activity effectively enhances attractive interactions between particles and leaves intact the critical properties of phase separation.
