摘要翻译:
用一维连续谱描述了不动杂质在邻近表面的生长,发现杂质抑制表面上原子的扩散时,会引起阶跃聚束。在本文中,我们通过二维固体对固体模型的动力学Monte-Carlo模拟来验证这一预测。我们确定了准一维台阶流对岛形成和台阶弯曲稳定的条件,并详细分析了杂质浓度分布的统计特性。通过监测台阶对的运动来确定杂质诱导的台阶相互作用的符号和强度。包含多达20个步骤的组件对单个步骤的发射来说是不稳定的。这种行为可以追溯到有效的杂质诱导的ADAtoms附着不对称性的小值。导出了稳定一束团所需的临界步数的解析估计,并通过一维模型的模拟证实了这一点。
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英文标题:
《Impurity-induced step interactions: a kinetic Monte-Carlo study》
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作者:
J\"urgen Vollmer, J\'ozsef Heged\"us, Frank Grosse and Joachim Krug
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最新提交年份:
2007
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分类信息:
一级分类:Physics 物理学
二级分类:Statistical Mechanics 统计力学
分类描述:Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变,热力学,场论,非平衡现象,重整化群和标度,可积模型,湍流
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一级分类:Physics 物理学
二级分类:Materials Science 材料科学
分类描述:Techniques, synthesis, characterization, structure. Structural phase transitions, mechanical properties, phonons. Defects, adsorbates, interfaces
技术,合成,表征,结构。结构相变,力学性质,声子。缺陷,吸附质,界面
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英文摘要:
A one-dimensional continuum description of growth on vicinal surfaces in the presence of immobile impurities predicts that the impurities can induce step bunching when they suppress the diffusion of adatoms on the surface. In the present communication we verify this prediction by kinetic Monte-Carlo simulations of a two-dimensional solid-on-solid model. We identify the conditions where quasi one-dimensional step flow is stable against island formation or step meandering, and analyse in detail the statistics of the impurity concentration profile. The sign and strength of the impurity-induced step interactions is determined by monitoring the motion of pairs of steps. Assemblies containing up to 20 steps turn out to be unstable towards the emission of single steps. This behavior is traced back to the small value of the effective, impurity-induced attachment asymmetry for adatoms. An analytic estimate for the critical number of steps needed to stabilize a bunch is derived and confirmed by simulations of a one-dimensional model.
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PDF链接:
https://arxiv.org/pdf/711.131