Dynamics of two-dimensional binary dusty plasma in liquid-like state

Abstract

Using a driven-dissipative Langevin dynamics simulation, the dynamics of two-dimensional binary dusty plasma in the liquid-like state has been investigated. The system consists of charge-asymmetric microparticles with an identical charge-mass ratio. To include the effect of particle size on the dynamics of the system, a modified Yukawa potential with consideration of the particle radius is employed to account for the electrostatic interaction between the charged particles. It is found that the mean squared displacement (MSD) of the system changes little when the ratio of particle radius to interparticle spacing is up to the order of magnitude of one tenth. By analyzing MSD at different time scales, coexistence of the distinct self-diffusion regimes for the two species is observed. The compositions of the two species together with the effective coupling strength of the system are responsible for the motion separation of the two species.