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Morphologies of Self-Assembled Quantum Dots: A Variational Approach

Published online by Cambridge University Press:  17 March 2011

R. Arief Budiman and
Harry E. Ruda
R. Arief Budiman
Affiliation:
University of Toronto, Toronto, Ontario M5S 3E3, Canada
Harry E. Ruda
Affiliation:
University of Toronto, Toronto, Ontario M5S 3E3, Canada
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Abstract

We construct a 3D model for coherent island formation by (i) using a novel 3D strain tensor to account for bulk strains and (ii) representing adatom di.usion as an external field that perturbs an otherwise. at strained layer. Equilibrium shapes of coherent islands and wetting layer thickness are obtained. Coherently compressed layers are typically unstable, but become stable in tension. Comparisons with Si1-xGex/Si(001) and Si0.5Ge0.5/Si1-xGex(001) layers are discussed.

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