Structures and Dynamics of a Two-Dimensional Confined Dusty Plasma System

摘要

＜正＞ The influence of the confining potential strength and temperature on the structures and dynamics of atwo-dimensional （2D） dusty plasma system is investigated through molecular dynamic （MD） simulation. The circularsymmetric confining potential leads to the nonuniform packing of particles, that is, an inner core with a hexagon latticesurrounded by a few outer circular shells. Under the appropriate confining potential and temperature, the particletrajectories on middle shells form a series of concentric and nested hexagons due to tangential movements of particles.Mean square displacement, self-diffusion constant, pair correlation function, and the nearest bond are used to characterizethe structural and dynamical properties of the system. With the increase of the confining potential, the radial andtangential movements of particles have different behaviors. With the increase of temperature, the radial and tangentialmotions strengthen, particle trajectories gradually become disordered, and the system gradually changes from a crystalor liquid state to a gas state.