Equilibrium phase diagrams for the elongation of epitaxial quantum dots into hut-shaped clusters and quantum wires

I. Daruka, C. Grossauer, G. Springholz, J. Tersoff

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The formation of self-assembled nanoislands is an important and much-studied feature of strained layer epitaxial growth. The varied island shapes such as pyramids, hut clusters, and elongated nanowires are considered promising building blocks for nanodevice applications. However, even some basic aspects of their growth and energetics are not fully understood. In particular, for Ge on Si (001), it has been recently proposed that the low surface energy of {105} facets renders the (001) surface unstable even neglecting bulk strain energy. Here we calculate how the competition between strain, surface energies, and edge energies determines the equilibrium shapes of epitaxial islands. In particular, we examine the novel regimes that can arise when the (001) surface becomes unstable against faceting. Our calculations thus provide an overview of the equilibrium island shapes as a natural starting point for consideration of possible kinetic effects.

Original languageEnglish
Article number235427
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number23
DOIs
Publication statusPublished - Jun 20 2014

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Semiconductor quantum wires
quantum wires
Interfacial energy
Semiconductor quantum dots
elongation
Phase diagrams
Elongation
quantum dots
phase diagrams
wire
surface energy
Strain energy
Epitaxial growth
Nanowires
pyramids
Kinetics
flat surfaces
nanowires
energy
kinetics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Equilibrium phase diagrams for the elongation of epitaxial quantum dots into hut-shaped clusters and quantum wires. / Daruka, I.; Grossauer, C.; Springholz, G.; Tersoff, J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 89, No. 23, 235427, 20.06.2014.

Research output: Contribution to journalArticle

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