Electromechanical effects in electron structure for GaN/AlN quantum dots

We study the impact of using the fully coupled electromechanical equations including piezoelectric effect and spontaneous polarization as compared to the semi-coupled approach, where the strain is solved first without piezoelectric coupling and then inserted into the equation for the electric potent...

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Bibliographic Details
Published in:Journal of physics. Conference series 2008-03, Vol.107 (1), p.012008
Main Authors: Lassen, B, Willatzen, M, Barettin, D, Melnik, R V N, Voon, L C Lew Yan
Format: Article
Language:English
Subjects:
Electronic structure
Physics
Piezoelectricity
Quantum dots
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Summary:We study the impact of using the fully coupled electromechanical equations including piezoelectric effect and spontaneous polarization as compared to the semi-coupled approach, where the strain is solved first without piezoelectric coupling and then inserted into the equation for the electric potential. We show that for circular GaN/AlN quantum dots the fully coupled approach is needed for dots with a radius comparable to or larger than the height, however, when the radius is smaller than the height the semi-coupled approach is sufficient. We highlight this by studying the effect on the electronic structure using an effective mass approximation.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/107/1/012008