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2006 | 110 | 2 | 237-242
Article title

Effects of Nonlinear Elasticity and Electromechanical Coupling on Optical Properties of InGaN/GaN and AlGaN/AlN Quantum Wells

Content
Title variants
Languages of publication
EN
Abstracts
EN
We present theoretical studies of effects of the nonlinear elasticity and the electromechanical coupling on the optical properties of InGaN/GaN and AlGaN/AlN quantum wells. In these structures, due to the lattice misfit between constituents, the quantum wells are compressively strained and the intrinsic hydrostatic pressure is present. Therefore, the nonlinear elasticity is investigated by taking into account the pressure dependence of elastic stiffness tensor for the strained quantum wells. We show that this effect leads to (i) decrease in the volumetric strain and (ii) increase in the polarization-induced built-in electric field in the quantum wells. Consequently, the interband transition energies in the quantum wells decrease when the nonlinear elasticity of nitrides is considered. On the other hand, we show that the effect of electromechanical coupling, i.e., co-existence of ordinary and converse piezoelectric effects results in increase in the interband transition energies in the considered quantum wells. It turns out that the influence of the nonlinear elasticity on the optical properties is stronger than the influence of electromechanical coupling for InGaN/GaN quantum wells, while for AlGaN/GaN the opposite situation is observed.
Keywords
EN
Publisher

Year
Volume
110
Issue
2
Pages
237-242
Physical description
Dates
published
2006-08
received
2006-06-17
Contributors
author
  • Unipress, Institute of High Pressure Physics, Polish Academy of Sciences, Sokołowska 29, 01-142 Warszawa, Poland
author
  • Institute of Theoretical Physics and Interdisciplinary Center for Materials Modeling, Warsaw University, Hoża 69, 00-681 Warszawa, Poland
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv110n218kz
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