Irreversible island growth in the presence of anisotropic surface diffusion with long jumps

P. Alex Greaney; D. C. Chrzan

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Irreversible island growth in the presence of anisotropic surface diffusion with long jumps

机译：各向异性表面扩散和跳远的情况下不可逆的岛状增长

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Kinetic Monte Carlo (KMC) simulations are used to investigate the dynamics of island growth during submonolayer epitaxy in the presence of anisotropic surface diffusion, and the influence of a recently hypothesized crowdion diffusion mechanism. An existing rate equation mean-field analysis of island growth is extended to include anisotropic diffusion. The mean-field analysis is found to be at odds with results from KMC simulations indicating that the details of the surface diffusion mechanism influence the nucleation rate. It is found that anisotropy in adatom hopping reduces the density of stable islands. It is also found that although the shape of the island size distribution is sensitive to island relaxation processes, it is not discernibly affected by hopping anisotropy with ratios D_(xx)/D_(yy) up to 16.

机译：动力学蒙特卡洛（KMC）模拟用于研究存在各向异性表面扩散的亚单层外延过程中岛生长的动力学，以及最近假设的拥挤扩散机制的影响。现有的岛生长速率方程均场分析扩展到包括各向异性扩散。发现平均场分析与KMC模拟的结果不一致，表明表面扩散机制的细节会影响成核速率。发现在原子跳跃中的各向异性降低了稳定岛的密度。还发现，尽管岛尺寸分布的形状对岛松弛过程敏感，但它不受比率D_（xx）/ D_（yy）高达16的跳变各向异性的明显影响。

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《Physical review. B, Condensed Matter And Materials Physics》 |2005年第11期|p.115432.1-115432.14|共14页
作者
P. Alex Greaney; D. C. Chrzan;
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作者单位

Materials Science Division, Lawrence Orlando Berkeley National Laboratory, Berkeley, California 94720, USA;

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正文语种 eng
中图分类固体物理学;
关键词
nucleation and growth: microscopic aspects; diffusion; interface formation; diffusion of adsorbates; kinetics of coarsening and aggregation; statistical mechanics of adsorbates;

机译：成核和生长：微观方面;扩散;界面形成;被吸附物的扩散;扩散粗化和聚集的动力学;吸附物的统计力学;

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Irreversible island growth in the presence of anisotropic surface diffusion with long jumps

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