NDLI: Size and Piezoelectric Effects on Optical Properties of Self-Assembled InGaAs/GaAs Quantum Dots

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Kuo, M. K. Lin, T. R. Hong, K. B.
Copyright Year	2006
Abstract	Size effects on optical properties of self-assembled quantum dots are analyzed based on the theories of linear elasticity and of strain-dependent k-p with the aid of finite element analysis. The quantum dot is made of InGaAs with truncated pyramidal shape on GaAs substrate. The three-dimensional steady-state effective-mass Schro¨dinger equation is adopted to find confined energy levels as well as wave functions both for electrons and holes of the quantum-dot nanostructures. Strain-induced as well as piezoelectric effects are taken into account in the carrier confinement potential of Schro¨dinger equation. The optical transition energies of quantum dots, computed from confined energy levels for electrons and holes, are significantly different for several quantum dots with distinct sizes. It is found that for QDs with the the larger the volume of QD is, the smaller the values of the optical transition energy. Piezoelectric effect, on the other hand, splits the p-like degeneracy for the electron first excited state about 1~7 meV, and leads to anisotropy on the wave function.
Sponsorship	Materials Division, Nondestructive Evaluation Division, and Pressure Vessels and Piping Division
Starting Page	347
Ending Page	352
Page Count	6
File Format	PDF
ISBN	079184773X
DOI	10.1115/IMECE2006-15776
e-ISBN	0791837904
Volume Number	Materials, Nondestructive Evaluation, and Pressure Vessels and Piping
Conference Proceedings	ASME 2006 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2006-11-05
Publisher Place	Chicago, Illinois, USA
Access Restriction	Subscribed
Subject Keyword	Finite element method Quantum dot Optical property Piezoelectric effect Induced strain Piezoelectricity Self-assembly Gallium arsenide Quantum dots
Content Type	Text
Resource Type	Article

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