Stability of an hexagonal array of coherently strained conical islands against Ostwald ripening

V. A. Shchukin, D. Bimberg, T P Munt, David E. Jesson

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We present a linear stability analysis of an hexagonal array of coherently strained islands against the exchange of material between islands. Surprisingly, ultra-dense arrays are found to be metastable due to the short-range stabilizing effect of elastic interactions which overcome the destabilizing contribution of surface energy. Mean-field simulations are used to investigate the ripening kinetics of local volume defects in arrays which are found to equilibrate through island volume oscillations. Simulations of global perturbations directly verify the existence of the metastable regime and confirm the nature of the most unstable mode as derived from the stability analysis for sub-critical island coverage. © 2005 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)237-256
Number of pages20
JournalAnnals of Physics
Volume320
Issue number1
DOIs
Publication statusPublished - Nov 2005

Keywords

  • Elasticity
  • Quantum dots
  • Stability
  • Strain relaxation
  • Thin films

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