The Oscillation Of Active Particles In Channel-connected Chambers

As a kind of soft matter,active materials have attracted much attention because of the characteristic that each particle of the system suffers independent driving force.In recent years,many studies have shown that active matters can express abundant physical phenomena.Under the background,we confine active brown particles(ABP)in channelconnected chambers in the two-dimensional plane,and adopt Langevin dynamics simulation method to survey the motion behavior of active matters in this geometry space.Moreover,we explore the influence of changing physical and numerical parameters on the motion behaviors.By using computational simulations,we observed that active particles can alternately fill and empty two microchambers connected by thin channels.This behavior can be called self-sustained oscillation phenomenon.A series of important and interesting conclusions have been found in the research of conditions in which self-oscillation would occur.Through the comparative study,the simulations indicated that thermal noise results of temperature can promote the occurrence of self-oscillation,and the oscillation period decreases with the rise of temperature.There is a certain range of active force and rotational diffusion coefficient that can observe self-sustained oscillation phenomenon,while the oscillation period decreases along with increased value of both parameters.Moreover,after changing the figure of two chambers,we find that system can express completed selfoscillation behaviors under the situation of appropriate channel parameters and proper particle quantities.