Controlling the optical properties of quantum dots and nanocrystals using size, composition and strain

Garnett W. Bryant; J. G. Díaz; M. Zieliński; W. Jaskólski

doi:10.1117/12.697327

2 February 2007 Controlling the optical properties of quantum dots and nanocrystals using size, composition and strain

Garnett W. Bryant, J. G. Díaz, M. Zieliński, W. Jaskólski

Proceedings Volume 6481, Quantum Dots, Particles, and Nanoclusters IV; 648102 (2007) https://doi.org/10.1117/12.697327
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

Abstract

We exploit atomistic tight-binding theory to describe the effects of dot size, composition, internal strain and applied strain on the confined states in nanocrystals and quantum dots. Both types of strain are critical, so we include the local strain and the externally imposed strain on an equal footing via an atomistic valence force field approach. A tightbinding model including an sp³s*d⁵ orbital model and spin-orbit effects is used. Several examples are discussed, including GaAs nanocrystals, InP nanocrystals under pressure, and core-shell nanocrystals, to highlight the importance of using atomistic models, extending tight-binding models to include d states, and having both internal and applied strain.

Citation Download Citation

Garnett W. Bryant, J. G. Díaz, M. Zieliński, and W. Jaskólski "Controlling the optical properties of quantum dots and nanocrystals using size, composition and strain", Proc. SPIE 6481, Quantum Dots, Particles, and Nanoclusters IV, 648102 (2 February 2007); https://doi.org/10.1117/12.697327

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KEYWORDS

Nanocrystals

Zinc

Cadmium sulfide

Quantum dots

Gallium arsenide

Chemical species

Optical properties

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