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Influence of composition on the piezoelectric effect and on the conduction band energy levels of InxGa1−xAs∕GaAs quantum dots

Authors :
Max A. Migliorato
Mark Hopkinson
John H. Jefferson
M. Fearn
P. Navaretti
A. G. Cullis
Matthew J. Steer
D. Powell
S. L. Liew
Source :
Journal of Applied Physics. 96:5169-5172
Publication Year :
2004
Publisher :
AIP Publishing, 2004.

Abstract

We address fundamental issues relating to the symmetry of the shape and the nonuniform composition of InGaAs quantum dot islands. Using atomistic simulations in the framework of the Tersoff empirical potential, we study the effect of compositional gradients in the In distribution on the piezoelectric effect in quantum dots. We demonstrate that the internal piezoelectric fields contribute strongly to the experimentally observed optical anisotropies. This is confirmed by accurate high-resolution transmission electron microscopy analysis over hundreds of islands grown in different conditions that reveals the absence of structural anisotropy under our growth conditions.

Details

ISSN :
10897550 and 00218979
Volume :
96
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........fb938390c175d46c2130503d7e8f1a24
Full Text :
https://doi.org/10.1063/1.1793333