Static Structure of Active Brownian Hard Disks

TL;DR

This paper investigates how activity influences the static structure of two-dimensional active Brownian particles with hard-disk interactions, revealing increased ordering and phase separation precursors through simulation data.

Contribution

It provides detailed simulation data on the static structure of active Brownian particles, highlighting the effects of activity parameters on structural ordering.

Findings

Activity increases structural ordering.

A peak at zero wave vector indicates phase separation.

Results serve as reference data for future theories.

Abstract

We explore the changes in static structure of a two-dimensional system of active Brownian particles (ABP) with hard-disk interactions, using event-driven Brownian dynamics simulations. In particular, the effect of the self-propulsion velocity and the rotational diffusivity on the orientationally-averaged fluid structure factor is discussed. Typically activity increases structural ordering and generates a structure factor peak at zero wave vector which is a precursor of motility-induced phase separation. Our results provide reference data to test future statistical theories for the fluid structure of active Brownian systems.