Evolution of the spatial structure of the massive charged grains in the presence of weak linearly space‐dependent external force in a dusty plasma is studied using molecular dynamics simulation. The interaction among the dust grains in the background electron‐ion plasma is described by a modified Yukawa interaction potential that includes both repulsive and attractive ranges. Evolution of the initially homogeneously distributed dust grains is followed until a quasi‐stationary state is reached. Even though the external force is radially highly asymmetric, the final configuration of the charged grains can be a circular crystal. Still driven by the external force, the grains in the crystal execute synchronized oscillations in the direction of the force. The time needed to reach the quasi‐stationary state decreases with increase of the strength of the external force.

中文翻译：

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谐波力场中带电晶粒的演化

使用分子动力学模拟研究了在尘土等离子体中存在弱线性依赖于空间的外力的情况下，块状带电晶粒空间结构的演化。背景电子离子等离子体中尘埃粒子之间的相互作用由修饰的Yukawa相互作用势描述，该势包括排斥范围和吸引范围。跟踪最初均匀分布的尘埃颗粒的演化，直到达到准稳态。即使外力在径向上高度不对称，带电晶粒的最终结构也可以是圆形晶体。仍受外力驱动，晶体中的晶粒沿力的方向执行同步振荡。