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

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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: \(\hbox {GaAs/Ga}_{{x}}\hbox {Al}_{{(1-x)}}\hbox {As}\) 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 \(\hbox {GaAs/Ga}_{{x}}\hbox {Al}_{{(1-x)}}\hbox {As}\) 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.

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Acknowledgements

The authors acknowledge funding for this work from the Iran National Science Foundation (INSF) through research project no. 94010730.

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  1. Department of Physics, Faculty of Science, Qom University of Technology, Qom, Iran

    M. Solaimani

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Solaimani, M. Intersubband optical properties of three electrons confined in multishell quantum dots: comparison of two semiconducting compounds. J Comput Electron 17, 1135–1142 (2018). https://doi.org/10.1007/s10825-018-1187-8

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  • DOI: https://doi.org/10.1007/s10825-018-1187-8

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