Influence of supersaturation on surface structure.
Influence of supersaturation on surface structure.
复制标题
过饱和度对表面结构的影响。
DOI：
10.1103/physrevlett.89.266103
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发表时间：
2002
影响因子：
8.6
通讯作者：
R. Tromp
中科院分区：
文献类型：
--
作者：
J. Hannon;J. Tersoff;M. Reuter;R. Tromp
使用低能电子显微镜，我们研究了高温生长和蚀刻过程中外部通量对 Si(111) 表面结构的影响。我们发现改变吸附原子过饱和度可以有效改变共存的 7 x 7 和“1 x 1”表面区域的表面自由能。作为响应，分隔相的边界采用新的稳态配置。测量的配置可用于定量确定相之间的自由能差 Deltagamma。 Deltagamma 的变化提供了表面局部过饱和度的测量，并且可以解释为相变温度的变化。
Using low-energy electron microscopy, we have investigated the influence of an external flux on the structure of the Si(111) surface during growth and etching at elevated temperatures. We find that varying the adatom supersaturation effectively changes the surface free energies of coexisting 7 x 7 and '1 x 1' regions of the surface. In response, the boundaries separating the phases adopt a new steady-state configuration. The measured configuration can be used to quantitatively determine the difference in free energy between the phases, Deltagamma. The change in Deltagamma provides a measure of the local supersaturation at the surface, and can be interpreted as a change in the phase-transition temperature.