Session G12: Self-Assembled Nanostructures: Growth and Patterning
8:00 AM–11:00 AM, Tuesday, March 14, 2006
Baltimore Convention Center Room: 304
Sponsoring Units:
DCMP DMP
Chair: Christian Ratsch, University of California, Los Angeles
Abstract ID: BAPS.2006.MAR.G12.11
Abstract: G12.00011 : Shape and Composition Map of a Prepyramid Quantum Dot
10:00 AM–10:12 AM
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Abstract 
Author:
Brian Spencer
(SUNY Buffalo)
We present a theory for the shape, size, and nonuniform composition profile of a small prepyramid island in an alloy epitaxial film when surface diffusion is much faster than deposition and bulk diffusion. The predicted composition profile has segregation of the larger misfit component to the island peak, with segregation enhanced by misfit strain and solute strain but retarded by alloy solution thermodynamics. Vertical composition gradients through the center of the island due to this mechanism are on the order of 2\%/nm for Ge$_X$Si$_{1-X}$/Si and 10 - 15\%/nm for In$_X$GaAs$_{1-X}$/GaAs [PRL 95, 206101 (2005)].
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.MAR.G12.11