升华过程中邻面台阶束的反粗化及复杂动力学
Anti-Coarsening and Complex Dynamics of Step Bunches on Vicinal Surfaces during Sublimation
摘要：
当附着-脱离动力学不对称时，升华邻位晶体表面可以经历阶跃聚束不稳定性，在正常的Ehrlich-Schwoebel效应的意义上。在这里，我们研究这种不稳定性的模型，考虑到升华和步骤步骤之间的相互作用，这打破了体积守恒特性的动态假设在以前的工作之间的微妙的相互作用。在系统推导出的表面轮廓连续方程的基础上，我们认为非保守项对新兴台阶束的大小构成了限制。这一结论是支持广泛的模拟的离散步骤的动力学，这表明大束分裂成较小的，以及逮捕粗化和周期性振荡的状态与不同数量的束。
英文摘要：
A sublimating vicinal crystal surface can undergo a step bunching instability when the attachment-detachment kinetics is asymmetric, in the sense of a normal Ehrlich-Schwoebel effect. Here we investigate this instability in a model that takes into account the subtle interplay between sublimation and step-step interactions, which breaks the volume-conserving character of the dynamics assumed in previous work. On the basis of a systematically derived continuum equation for the surface profile, we argue that the non-conservative terms pose a limitation on the size of emerging step bunches. This conclusion is supported by extensive simulations of the discrete step dynamics, which show breakup of large bunches into smaller ones as well as arrested coarsening and periodic oscillations between states with different numbers of bunches.
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