Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary.
Phys Rev Lett. 2010 Sep 10;105(11):115004. doi: 10.1103/PhysRevLett.105.115004.
We report a series of complex (dusty) plasma experiments, aimed at the study of the detailed time evolution of the recrystallization process following a rapid quench of a two-dimensional dust liquid. The experiments were accompanied by large-scale (million-particle) molecular dynamics simulations, assuming Yukawa-type interparticle interaction. Both experiment and simulation show a ∝t(α) (power-law) dependence of the linear crystallite domain size as measured by the bond-order correlation length, translational correlation length, dislocation (defect) density, and a direct size measurement algorithm. The results show two stages of order formation. On short time scales, individual particle motion dominates; this is a fast process characterized by α=0.93±0.1. At longer time scales, small crystallites undergo collective rearrangement, merging into bigger ones, resulting in a smaller exponent α=0.38±0.06.
我们报告了一系列复杂（尘埃）等离子体实验，旨在研究二维尘埃液体快速淬火后再结晶过程的详细时间演化。实验伴随着大规模（百万粒子）分子动力学模拟，假设粒子间存在 Yukawa 型相互作用。实验和模拟都显示，线性晶畴尺寸的测量结果（通过键序相关长度、平移相关长度、位错（缺陷）密度以及直接的尺寸测量算法）与 t(α)（幂律）存在依赖关系。结果表明存在两个有序形成阶段。在短时间尺度上，单个粒子的运动占主导地位；这是一个快速过程，其特征在于 α=0.93±0.1。在较长时间尺度上，小晶体经历集体重排，合并成更大的晶体，导致较小的指数 α=0.38±0.06。
