硬球早期成核过程呈现同步有序化和致密化
The Early Crystal Nucleation Process in Hard Spheres shows Synchronised Ordering and Densification
摘要：
我们调查的硬球流体中的晶体成核过程的早期部分使用计算机模拟产生的数据。我们发现，六角秩序体现连续在过压缩液体，开始约一个扩散时间之前出现的第一个“固体状”颗粒的成核簇，并集体涌入的粒子对成核网站同时发生的订购过程：密度增加导致成核产生相同的个别粒子位移的顺序增加。我们排除了中期和低超压缩之间的早期成核过程中存在的质的差异，也提供了证据，反对任何分离的平移和取向顺序的相关长度尺度。
英文摘要：
We investigate the early part of the crystal nucleation process in the hard sphere fluid using data produced by computer simulation. We find that hexagonal order manifests continuously in the overcompressed liquid, beginning approximately one diffusion time before the appearance of the first `solid-like' particle of the nucleating cluster, and that a collective influx of particles towards the nucleation site occurs simultaneously to the ordering process: the density increases leading to nucleation are generated by the same individual particle displacements as the increases in order. We rule out the presence of qualitative differences in the early nucleation process between medium and low overcompressions, and also provide evidence against any separation of translational and orientational order on the relevant lengthscales.
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