Department of Theoretical Physics, Vilnius University, Saulėtekio 9, LT-10222 Vilnius, Lithuania.
J Phys Condens Matter. 2011 Sep 28;23(38):385301. doi: 10.1088/0953-8984/23/38/385301. Epub 2011 Sep 5.
We study the distribution of topological defects in two-dimensional Coulomb clusters with parabolic lateral confinement. The minima hopping algorithm based on molecular dynamics is used to efficiently locate the ground- and low-energy metastable states, and their structure is analysed by means of the Delaunay triangulation. The size, structure and distribution of geometry-induced lattice imperfections strongly depends on the system size and the energetic state. Besides isolated disclinations and dislocations, classification of defect motifs includes defect compounds-grain boundaries, rosette defects, vacancies and interstitial particles. Proliferation of defects in metastable configurations destroys the orientational order of the Wigner lattice.
我们研究了具有抛物线横向约束的二维库仑团簇中的拓扑缺陷分布。基于分子动力学的最小跳跃算法被用于有效地定位基态和低能亚稳态，并通过 Delaunay 三角剖分分析它们的结构。几何诱导晶格不完整性的大小、结构和分布强烈依赖于系统尺寸和能量状态。除了孤立的挠曲和位错，缺陷模式的分类还包括缺陷化合物——晶界、蔷薇缺陷、空位和间隙粒子。亚稳态构型中缺陷的增殖破坏了威格纳晶格的取向序。
