Active-parameter polydispersity in the 2d ABP Yukawa model

Abstract

In both experiments and simulations the most commonly studied kind of parameter polydispersity is that of varying particles size. This paper investigates by simulations the effects of introducing polydispersity in other parameters for two-dimensional Active Brownian Particles with Yukawa pair interactions. Polydispersity is studied separately in the translational and rotational diffusion coefficients, as well as in the swim velocity $v_0$. Uniform and binary parameter distributions are considered in both the homogeneous and the motility-induced phase-separation (MIPS) phases. We find only minute changes in structure and dynamics upon the introduction of parameter polydispersity, even for situations involving 50% polydispersity. The reason for this is not clear. An exception is the case of $v_0$ polydispersity for which the average radial distribution function with changing polydispersity shows significant variations in the MIPS phase. Even in this case, however, the dynamics is only modestly affected. As a possible application of our findings, we suggest that a temporary introduction of polydispersity into a single-component active-matter model characterized by a very long equilibration time, i.e., a glass-forming active system, may be used to equilibrate the system efficiently by particle swaps.

References in corpus (10)

• Motility-Induced Phase Separation
• Active matter
• Effective Interactions in Active Brownian Suspensions
• Spontaneous velocity alignment in Motility-induced Phase Separation
• Tunable long range forces mediated by self-propelled colloidal hard spheres
• Energy Landscape, Anti-Plasticization and Polydispersity Induced Crossover of Heterogeneity in Supercooled Polydisperse Liquids
• Glassy Dynamics in Chiral Fluids
• Configurational temperature in active matter. II. Quantifying the deviation from thermal equilibrium
• Even strong energy polydispersity does not affect the average structure and dynamics of simple liquids
• Active-matter isomorphs in the size-polydisperse Ornstein-Uhlenbeck Lennard-Jones model

Cited by in corpus (1)

• Mobility-induced phase separation in a binary mixture of active Brownian particles