论文标题
偶极 - 偶极相互作用对运动诱导的相分离的影响
Impact of dipole-dipole interactions on motility-induced phase separation
论文作者
论文摘要
我们为偶极活跃的布朗颗粒系统提供了流体动力学理论，该系统在弱偶极耦合方面预测运动性诱导的相分离（MIPS）的发作，与布朗动力学（BD）模拟一致。流体动力方程是通过显式粗粒的微观langevin动力学得出的，从而可以对进入粗粒模型和粒子分辨模拟的参数进行定量比较。进行固定密度的BD模拟，我们发现偶极相互作用倾向于阻碍MIP，如[Liao等，软物质，2020，16，2208]中首次报道。在这里，我们证明了理论方法确实捕捉了MIP的抑制。此外，对获得的角度依赖性相关函数的分析将光散发到潜在的微观机制中，从而导致均匀相位的稳定。
We present a hydrodynamic theory for systems of dipolar active Brownian particles which, in the regime of weak dipolar coupling, predicts the onset of motility-induced phase separation (MIPS), consistent with Brownian dynamics (BD) simulations. The hydrodynamic equations are derived by explicitly coarse-graining the microscopic Langevin dynamics, thus allowing for a quantitative comparison of parameters entering the coarse-grained model and particle-resolved simulations. Performing BD simulations at fixed density, we find that dipolar interactions tend to hinder MIPS, as first reported in [Liao et al., Soft Matter, 2020, 16, 2208]. Here we demonstrate that the theoretical approach indeed captures the suppression of MIPS. Moreover, the analysis of the numerically obtained, angle-dependent correlation functions sheds light into the underlying microscopic mechanisms leading to the destabilization of the homogeneous phase.
