Formation and stability of self-assembled coherent islands in highly mismatched heteroepitaxy

Details Formation and stability of self-assembled coherent islands in highly mismatched heteroepitaxy Formation and stability of self-assembled coherent islands in highly mismatched heteroepitaxy

1999-05-10

arxiv.org/abs/cond-mat/9905122v2

Physics

Condensed Matter

Materials Science

4 pages, 5 figures, In print, Phys. Rev. Lett. Other related publications can be found at http://www.fhi-berlin.mpg.de/th/pape

Scientific paper

10.1103/PhysRevLett.82.4042

We study the energetics of island formation in Stranski-Krastanow growth within a parameter-free approach. It is shown that an optimum island size exists for a given coverage and island density if changes in the wetting layer morphology after the 3D transition are properly taken into account. Our approach reproduces well the experimental island size dependence on coverage, and indicates that the critical layer thickness depends on growth conditions. The present study provides a new explanation for the (frequently found) rather narrow size distribution of self-assembled coherent islands.

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