修正屏蔽库仑势下二维尘埃等离子体的动力学和结构特性

Dynamical and structural properties of two-dimensional dusty plasma with modified screened coulomb potential

本文考虑等离子体密度分布变化,得到了修正屏蔽库仑势的解析解.数值分析以及分子动力学模拟表明,在常见实验室参数情况下,等离子体密度分布变化引起的屏蔽库仑势修正对二维尘埃等离子体系统的动力学和结构特性影响很小.在极限参数情况下,本模型的计算结果表明二维尘埃等离子体系统的扩散能力明显降低,并且系统组态呈圆形分布.此外。

The modified screened Coulomb potential is obtained with considering the changes of plasma number density. Both the analytical results and molecular dynamical simulation show that the modification due to the changes of number density has a minor effect on the dynamical and structural properties of the two-dimensional dusty plasmas. However, further modifications including such as the particle size, ion drag force and pressure force possibly change the profile of the spherically asymmetric Coulomb potential. Motivated by the above speculation, the modified screened Coulomb potential with a set of margin parameters is used to investigate the dynamical and structural properties of the two-dimensional dusty plasmas. It is found that the diffusion of system is extensively decreased, particularly, a circle configuration is formed, which is similar ho the experimental observation of spherical assemble. Additionally, a uniform magnetic field is used to investigate the effects on the dynamical and structural properties of the two-dimensional dusty plasmas.