三维格子中过冷流体的堵塞、弛豫和结晶
Jamming, relaxation and crystallization of a super-cooled fluid in a three-dimensional lattice
摘要：
研究了具有最近邻和次最近邻排斥的三维格点模型的非平衡动力学。在平衡时，模型经历一阶流固相变。非平衡填充，通过随机顺序吸附与扩散，创建无定形结构，并终止于无序状态与随机最紧密的包装密度，位于平衡固体制度。走向随机最紧密堆积的方法的特点是由两个不同的幂律制度，反映了形成的小的密集堆积的颗粒在长时间的制度的填充过程。然后，我们研究这些非晶结构的固定密度弛豫向固相。结晶的路线示出偏离由经典成核理论提出的简单的晶粒生长。我们的测量结果表明，弛豫主要是由相邻的结晶晶粒，存在于初始的非晶态聚结。
英文摘要：
Off-equilibrium dynamics of a three-dimensional lattice model with nearest- and next nearest-neighbors exclusions is studied. At equilibrium, the model undergoes a first-order fluid-solid transition. Non-equilibrium filling, through random sequential adsorption with diffusion, creates amorphous structures and terminates at a disordered state with random closest packing density that lies in the equilibrium solid regime. The approach towards random closest packing is characterized by two distinct power-law regimes, reflecting the formation of small densely packed grains in the long time regime of the filling process. We then study the fixed-density relaxation of these amorphous structures towards the solid phase. The route to crystallization is shown to deviate from the simple grain growth proposed by classical nucleation theory. Our measurements suggest that relaxation is driven mainly by coalescence of neighboring crystallized grains which exist in the initial amorphous state.
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