聚束宽度与宏台阶高度：台阶-台阶排斥效应的定量研究
Bunch width versus macrostep height: A quantitative study of the effects of step-step repulsion
摘要：
在生长晶体的表面处的台阶聚束可以由两个方向的驱动力引起：台阶上升和台阶下降。这些过程发生在不同的吸附原子浓度下，并且性质不同。在这项研究中，我们展示了如何聚束过程的整体图片取决于短程步进排斥的强度。在最近研究的基于元胞自动机的原子尺度晶体生长模型中引入了由一个附加参数控制的台阶间的排斥作用。结果表明，排斥修改聚束过程以不同的方式，取决于不稳定力的方向。特别是，聚束轮廓，稳定性图和各种聚束属性的时间标度依赖性的影响时，步进排斥增加。台阶之间的排斥产生了两个特征尺寸-聚束宽度和宏台阶高度之间的竞争，起到了描述台阶聚束现象的第二长度尺度的作用。一个新的特征时间尺度依赖于步-步排斥参数出现作为（01）刻面宏步和（11）刻面束之间的相互作用的效果。作为聚束主要特征尺寸的聚束高度不受斥力的显著影响。
英文摘要：
Bunching of steps at the surface of growing crystals can be induced by both directions of the driving force: step up and step down. The processes happen in different adatom concentrations and differ in character. In this study we show how the overall picture of the bunching process depends on the strength of short range step-step repulsion. The repulsive interaction between steps, controlled by an additional parameter, is introduced into the recently studied atomistic scale model of vicinal crystal growth, based on cellular automata. It is shown that the repulsion modifies bunching process in a different way, depending on the direction of the destabilizing force. In particular, bunch profiles, stability diagrams and time-scaling dependences of various bunch properties are affected when the step-step repulsion increases. The repulsion between steps creates a competition between two characteristic sizes - bunch width and macrostep height, playing the role of the second length scale that describes the step bunching phenomenon. A new characteristic time scale dependent on the step-step repulsion parameter emerges as an effect of interplay between (01) faceted macrosteps and (11) faceted bunches. The bunch height being the major characteristic size of the bunches is not influenced dramatically by the repulsion.
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