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Influence of composition on the piezoelectric effect and on the conduction band energy levels of InxGa1−xAs∕GaAs quantum dots
- 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.
- Subjects :
- X-ray absorption spectroscopy
Materials science
Condensed matter physics
General Physics and Astronomy
Piezoelectricity
Symmetry (physics)
Gallium arsenide
Condensed Matter::Materials Science
chemistry.chemical_compound
chemistry
Quantum dot
Transmission electron microscopy
Quantum dot laser
Anisotropy
Subjects
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