Intersubband optical properties of three electrons confined in multishell quantum dots: comparison of two semiconducting compounds

Intersubband optical properties of three electrons confined in multishell quantum dots:... We investigated the effect of the number of wells and quantum dot radius on the dipole matrix elements and optical properties of three electrons confined in concentric multishell quantum dots, comparing two different semiconducting compound nanostructures: $$\hbox {GaAs/Ga}_{{x}}\hbox {Al}_{{(1-x)}}\hbox {As}$$ GaAs/Ga x Al ( 1 - x ) As and InGaAs/InAlAs. We used a high-accuracy interpolation-based 14-point finite difference method to solve the corresponding Schrodinger equation. The results showed that, although InGaAs/InAlAs multishell quantum dots have lower absorption peak heights than the $$\hbox {GaAs/Ga}_{{x}}\hbox {Al}_{{(1-x)}}\hbox {As}$$ GaAs/Ga x Al ( 1 - x ) As ones, the effects of the quantum dot radius and number of wells on the optical properties are more intense in the studied InGaAs/InAlAs structures. Therefore, since a wider absorption peak height range can be spanned when using the InGaAs/InAlAs system, these structures are more tunable, which could facilitate selection of desired systems by experimentalists. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Computational Electronics Springer Journals

Intersubband optical properties of three electrons confined in multishell quantum dots: comparison of two semiconducting compounds

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Publisher
Springer US
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Engineering; Mathematical and Computational Engineering; Electrical Engineering; Theoretical, Mathematical and Computational Physics; Optical and Electronic Materials; Mechanical Engineering
ISSN
1569-8025
eISSN
1572-8137
D.O.I.
10.1007/s10825-018-1187-8
Publisher site
See Article on Publisher Site

Abstract

We investigated the effect of the number of wells and quantum dot radius on the dipole matrix elements and optical properties of three electrons confined in concentric multishell quantum dots, comparing two different semiconducting compound nanostructures: $$\hbox {GaAs/Ga}_{{x}}\hbox {Al}_{{(1-x)}}\hbox {As}$$ GaAs/Ga x Al ( 1 - x ) As and InGaAs/InAlAs. We used a high-accuracy interpolation-based 14-point finite difference method to solve the corresponding Schrodinger equation. The results showed that, although InGaAs/InAlAs multishell quantum dots have lower absorption peak heights than the $$\hbox {GaAs/Ga}_{{x}}\hbox {Al}_{{(1-x)}}\hbox {As}$$ GaAs/Ga x Al ( 1 - x ) As ones, the effects of the quantum dot radius and number of wells on the optical properties are more intense in the studied InGaAs/InAlAs structures. Therefore, since a wider absorption peak height range can be spanned when using the InGaAs/InAlAs system, these structures are more tunable, which could facilitate selection of desired systems by experimentalists.

Journal

Journal of Computational ElectronicsSpringer Journals

Published: Jun 4, 2018

References

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