论文标题
三维活性布朗颗粒的相分离和多体效应
Phase separation and multibody effects in three-dimensional active Brownian particles
论文作者
论文摘要
在三个维度上对排斥活性布朗颗粒的相图的模拟研究表明，高密度相和低密度相之间的相位分离区域被气体 - 晶相分离的区域包围。可以与简单的流体类似地确定近临界的基因座和结构跨界。与与短相对景点的平衡流体的行为相似的激励，我们表明，直接映射到稀数极限中的对势的映射意味着相互作用意味着相互作用对引发相位的相互作用不足。取而代之的是，这是由与颗粒笼相关的多体效应的出现驱动的，与颗粒笼有关，该粒子的数量密度足够高。我们通过从配置结构中提取的$ n $ body有效相互作用的信息理论度量来量化这些效果。
Simulation studies of the phase diagram of repulsive active Brownian particles in three dimensions reveal that the region of motility-induced phase separation between a high and low density phase is enclosed by a region of gas-crystal phase separation. Near-critical loci and structural crossovers can additionally be identified in analogy with simple fluids. Motivated by the striking similarity to the behaviour of equilibrium fluids with short-ranged pair-wise attractions, we show that a direct mapping to pair potentials in the dilute limit implies interactions that are insufficiently attractive to engender phase separation. Instead, this is driven by the emergence of multi-body effects associated with particle caging that occurs at sufficiently high number density. We quantify these effects via information-theoretical measures of $n$-body effective interactions extracted from the configurational structure.
