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Tunnel-Coupled Quantum Dots: Atomistic Theory of Quantum Dot Molecules and Arrays

Published online by Cambridge University Press:  11 February 2011

Garnett W. Bryant ,
Javier Aizpurua ,
W. Jaskolski  and
Michal Zielinski
Garnett W. Bryant
Affiliation:
Atomic Physics Division, National Institute of Standards and Technology, Gaithersburg, MD 20899–8423
Javier Aizpurua
Affiliation:
Atomic Physics Division, National Institute of Standards and Technology, Gaithersburg, MD 20899–8423
W. Jaskolski
Affiliation:
Instytut Fizyki, UMK, Grudziadzka 5, 87–100 Torun, Poland
Michal Zielinski
Affiliation:
Instytut Fizyki, UMK, Grudziadzka 5, 87–100 Torun, Poland
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Abstract

An understanding of how dots couple in quantum dot molecules and arrays is needed so that the possibilities for tailored nanooptics in these systems can be explored. The properties of tunnel-coupled dots will be determined by how the dots couple through atomic-scale junctions. We present an atomistic empirical tight-binding theory of coupled, CdS nanocrystal artificial-molecules, vertically and laterally coupled InAs/GaAs self-assembled dots, and arrays of InAs/GaAs self-assembled dots. Electron states follow the artificial molecule analogy. The coupling of hole states is much more complex. There are significant departures from the artificial molecule analogy because the interdot hole coupling is determined by the hole envelope functions, as for the electron states, and by the hole atomic state near interdot interfaces.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 737 , 2002 , E1.2
Copyright
Copyright © Materials Research Society 2003

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References

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