Optimal capping layer thickness for stacked quantum dots

X. B. Niu, Y. J. Lee, R. E. Caflisch, C. Ratsch

Research output: Contribution to journalArticlepeer-review


We study the effect of strain on the vertical and lateral self-organization of nanoscale patterns and stacked quantum dots during epitaxial growth. The computational approach is based on the level set method in combination with an atomistic strain code. Strain changes the energetics of microscopic parameters during growth, and thus determines the nucleation sites and the growth of islands and dots. Our results show that strain can lead to vertical alignment as well as lateral organization. Moreover, our simulations suggest that there is an optimal thickness of the capping layer to get the best alignment and most uniform size distribution of stacked quantum dots, and that its variation can be used to control the formation of interesting structures.

Original languageEnglish (US)
Article number086103
JournalPhysical Review Letters
Issue number8
StatePublished - Aug 22 2008

ASJC Scopus subject areas

  • General Physics and Astronomy


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