Hartmann Peter, Rosenberg Marlene, Kalman Gabor J, Donkó Zoltán
Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, Budapest, Hungary.
Phys Rev E Stat Nonlin Soft Matter Phys. 2011 Jul;84(1 Pt 2):016409. doi: 10.1103/PhysRevE.84.016409. Epub 2011 Jul 27.
Ground-state structures of finite, cylindrically confined two-dimensional Yukawa systems composed of charged superparamagnetic dust grains in an external magnetic field are investigated numerically, using molecular dynamic simulations and lattice summation methods. The ground-state configuration of the system is identified using, as an approximation, the experimentally obtained shape of the horizontal confinement potential in a classical single-layer dusty plasma experiment with nonmagnetic grains. Results are presented for the dependence of the number density and lattice parameters of the dust layer on (1) the ratio of the magnetic dipole-dipole force to electrostatic force between the grains and (2) the orientation of the grain magnetic moment with respect to the layer.
利用分子动力学模拟和晶格求和方法，对由处于外部磁场中的带电超顺磁尘埃颗粒组成的有限圆柱受限二维 Yukawa 系统的基态结构进行了数值研究。该系统的基态构型通过近似使用在经典单层非磁性颗粒尘埃等离子体实验中实验获得的水平约束势的形状来确定。给出了尘埃层的数密度和晶格参数与以下因素的关系：(1)颗粒间磁偶极 - 偶极力与静电力的比值；(2)颗粒磁矩相对于尘埃层的取向。
