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首页> 外文期刊>Physical review. B, Condensed Matter And Materals Physics >Temperature dependence of island growth shapes during submonolayer deposition of Ag on Ag(111)
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Temperature dependence of island growth shapes during submonolayer deposition of Ag on Ag(111)

机译：Ag在Ag（111）上的亚单层沉积过程中岛状生长形状的温度依赖性

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摘要

Growth shapes of Ag islands formed on Ag(111) during submonolayer deposition at different temperatures were studied with scanning tunneling microscopy, and analyzed via kinetic Monte Carlo simulation of a suitable atomistic lattice-gas model. Distinct shape transitions can be observed, from dendrites with triangular envelopes at low temperatures (below 140 K) to more isotropic fat fractal islands at intermediate temperatures, and then to distorted hexagonal shapes with longer B steps and shorter A steps at higher temperatures (above 170 K). In contrast, the equilibrium island shapes in this system are almost perfect hexagons displaying a near-sixfold symmetry. Modeling reveals that the broken symmetry of growth shapes at low and high temperatures derives from the interplay of diffusion-mediated aggregation with different aspects of a corner diffusion anisotropy. The broken symmetry is less clear at intermediate temperatures, where the near-isotropic fractal shapes reflect in part a kink Ehrlich-Schwoebel effect.
机译：用扫描隧道显微镜研究了在不同温度下亚单层沉积过程中在Ag（111）上形成的Ag岛的生长形状，并通过动力学Monte Carlo模拟了合适的原子格-气模型进行了分析。可以观察到明显的形状过渡，从低温（低于140 K）下具有三角形包膜的树枝状晶体到中等温度下更多的各向同性的脂肪分形岛，然后到高温下（在170以上）具有较长B步长和较短A步长的扭曲六角形形状。 K）。相反，该系统中的平衡岛形状几乎是完美的六边形，显示出接近六倍的对称性。模型表明，低温和高温下生长形状的破坏对称性源自扩散介导的聚集与角扩散各向异性的不同方面的相互作用。断裂的对称性在中等温度下不太清楚，在该温度下，各向同性的分形形状部分反映了扭结埃里希-舒沃贝尔效应。

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