Yang F, Kong W, Liu S F, Wang C Z
College of Science, Civil Aviation University of China, Tianjin 300300, China.
School of Physics, Nankai University, Tianjin 300071, China.
Phys Rev E. 2020 Oct;102(4-1):043213. doi: 10.1103/PhysRevE.102.043213.
Ground-state structures of a two-dimensional (2D) system composed of superparamagnetic charged particles are investigated by means of molecular dynamics simulation. The charged particles trapped in a quadratic potential interact with each other via the repulsive, attractive, and magnetic dipole-dipole forces. Simulations are performed within two regimes: a one-component system and a two-component system where the charged particles have the identical charge-to-mass ratio. The effects of magnetic dipole-dipole interaction, mixing ratio of the two species and confinement frequency on the ground-state structures are discussed. It is found that as the strength of the magnetic dipole increases, the charged particles tend to self-organize into chainlike structures. The two species particles exhibit different structural features, depending on the competition of electrostatic repulsive interaction, magnetic dipole-dipole interaction and confinement force. The potential lanes are observed through analyzing the global potential of the magnetic particles, which guide the unmagnetic particles aligning themselves in the direction of the potential lanes.
通过分子动力学模拟研究了由超顺磁性带电粒子组成的二维（2D）系统的基态结构。捕获在二次势中的带电粒子通过排斥力、吸引力和磁偶极-偶极力相互作用。模拟在两种情况下进行：单组分系统和带电粒子具有相同荷质比的双组分系统。讨论了磁偶极-偶极相互作用、两种粒子的混合比和约束频率对基态结构的影响。研究发现，随着磁偶极强度的增加，带电粒子倾向于自组织成链状结构。两种粒子表现出不同的结构特征，这取决于静电排斥相互作用、磁偶极-偶极相互作用和约束力的竞争。通过分析磁性粒子的全局势观察到了势通道，这些势通道引导非磁性粒子沿势通道方向排列。
