Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-09-09
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 pages, 5 figures
Scientific paper
A solid-on-solid model is generalized to study the formation of Ge pyramid islands bounded by (105) facets on Si(100) substrates in two dimensions. Each atomic column is not only characterized by the local surface height but also by two deformation state variables dictating the local surface tilt and vertical extension. These deformations phenomenologically model surface reconstructions in (105) facets and enable the formation of islands which better resemble faceted pyramids. We demonstrate the model by application to a kinetic limited growth regime. We observe significantly reduced growth rates after faceting and a continuous nucleation of new islands until overcrowding occurs.
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