Ehrlich-Schwoebel barrier controlled slope selection in epitaxial growth

被引:22
作者
Schinzer, S [1 ]
Köhler, S [1 ]
Reents, G [1 ]
机构
[1] Univ Wurzburg, Inst Theoret Phys, D-97074 Wurzburg, Germany
关键词
D O I
10.1007/s100510051111
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We examine the step dynamics in a 1 + 1-dimensional model of epitaxial growth based on the BCF-theory. The model takes analytically into account the diffusion of adatoms, an incorporation mechanism and an Ehrlich-Schwoebel barrier at step edges. We find that the formation of mounds with a stable slope is closely related to the presence of an incorporation mechanism. We confirm this finding using a solid-on-solid model in 2 + 1 dimensions. In the case of an infinite step edge barrier we are able to calculate the saturation profile analytically. Without incorporation but with inclusion of desorption and detachment we find a critical flux for instable growth but no slope selection. In particular, we show that the temperature dependence of the selected slope is solely determined by the Ehrlich-Schwoebel barrier which opens a new possibility in order to measure this fundamental barrier in experiments.
引用
收藏
页码:161 / 168
页数:8
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