Surface islands and their elastic interaction with adatoms

Demitris Kouris, Alonso Peralta, Karl Sieradzki

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

We describe the elastic interaction between adatoms on a (001) bcc surface and monolayer-high two- and three-dimensional islands, within the general context of thin-film growth. A discrete harmonic model based on the concepts of eigenstrain and surface stress yields the elastic field owing to the presence of adatoms and islands. Adatoms can be attracted or repelled by islands, depending on the sign of the interaction energy. Our results indicate that the elastic field does not generally favor a flat two-dimensional growth mode for homoepitaxy, or heteroepitaxy, when the overlayer is in compression. Based on elastic interactions alone, our results indicate that, in heteroepitaxy, two-dimensional step-flow growth becomes likely only for overlayers in tension. The model used in the study offers substantial advantages in computational efficiency when compared with atomic simulations that are the norm in this field.

Original languageEnglish (US)
Pages (from-to)420-429
Number of pages10
JournalSurface Science
Volume445
Issue number2-3
DOIs
StatePublished - Jan 20 2000

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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