Cargando…
Optical Properties of Conical Quantum Dot: Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence
The current work used the effective mass approximation conjoined with the finite element method to study the exciton states in a conical GaAs quantum dot. In particular, the dependence of the exciton energy on the geometrical parameters of a conical quantum dot has been studied. Once the one-particl...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10143034/ https://www.ncbi.nlm.nih.gov/pubmed/37110978 http://dx.doi.org/10.3390/nano13081393 |
_version_ | 1785033755263500288 |
---|---|
author | Gavalajyan, Sargis P. Mantashian, Grigor A. Kharatyan, Gor Ts. Sarkisyan, Hayk A. Mantashyan, Paytsar A. Baskoutas, Sotirios Hayrapetyan, David B. |
author_facet | Gavalajyan, Sargis P. Mantashian, Grigor A. Kharatyan, Gor Ts. Sarkisyan, Hayk A. Mantashyan, Paytsar A. Baskoutas, Sotirios Hayrapetyan, David B. |
author_sort | Gavalajyan, Sargis P. |
collection | PubMed |
description | The current work used the effective mass approximation conjoined with the finite element method to study the exciton states in a conical GaAs quantum dot. In particular, the dependence of the exciton energy on the geometrical parameters of a conical quantum dot has been studied. Once the one-particle eigenvalue equations have been solved, both for electrons and holes, the available information on energies and wave functions is used as input to calculate exciton energy and the effective band gap of the system. The lifetime of an exciton in a conical quantum dot has been estimated and shown to be in the range of nanoseconds. In addition, exciton-related Raman scattering, interband light absorption and photoluminescence in conical GaAs quantum dots have been calculated. It has been shown that with a decrease in the size of the quantum dot, the absorption peak has a blue shift, which is more pronounced for quantum dots of smaller sizes. Furthermore, the interband optical absorption and photoluminescence spectra have been revealed for different sizes of GaAs quantum dot. |
format | Online Article Text |
id | pubmed-10143034 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-101430342023-04-29 Optical Properties of Conical Quantum Dot: Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence Gavalajyan, Sargis P. Mantashian, Grigor A. Kharatyan, Gor Ts. Sarkisyan, Hayk A. Mantashyan, Paytsar A. Baskoutas, Sotirios Hayrapetyan, David B. Nanomaterials (Basel) Article The current work used the effective mass approximation conjoined with the finite element method to study the exciton states in a conical GaAs quantum dot. In particular, the dependence of the exciton energy on the geometrical parameters of a conical quantum dot has been studied. Once the one-particle eigenvalue equations have been solved, both for electrons and holes, the available information on energies and wave functions is used as input to calculate exciton energy and the effective band gap of the system. The lifetime of an exciton in a conical quantum dot has been estimated and shown to be in the range of nanoseconds. In addition, exciton-related Raman scattering, interband light absorption and photoluminescence in conical GaAs quantum dots have been calculated. It has been shown that with a decrease in the size of the quantum dot, the absorption peak has a blue shift, which is more pronounced for quantum dots of smaller sizes. Furthermore, the interband optical absorption and photoluminescence spectra have been revealed for different sizes of GaAs quantum dot. MDPI 2023-04-18 /pmc/articles/PMC10143034/ /pubmed/37110978 http://dx.doi.org/10.3390/nano13081393 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Gavalajyan, Sargis P. Mantashian, Grigor A. Kharatyan, Gor Ts. Sarkisyan, Hayk A. Mantashyan, Paytsar A. Baskoutas, Sotirios Hayrapetyan, David B. Optical Properties of Conical Quantum Dot: Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence |
title | Optical Properties of Conical Quantum Dot: Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence |
title_full | Optical Properties of Conical Quantum Dot: Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence |
title_fullStr | Optical Properties of Conical Quantum Dot: Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence |
title_full_unstemmed | Optical Properties of Conical Quantum Dot: Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence |
title_short | Optical Properties of Conical Quantum Dot: Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence |
title_sort | optical properties of conical quantum dot: exciton-related raman scattering, interband absorption and photoluminescence |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10143034/ https://www.ncbi.nlm.nih.gov/pubmed/37110978 http://dx.doi.org/10.3390/nano13081393 |
work_keys_str_mv | AT gavalajyansargisp opticalpropertiesofconicalquantumdotexcitonrelatedramanscatteringinterbandabsorptionandphotoluminescence AT mantashiangrigora opticalpropertiesofconicalquantumdotexcitonrelatedramanscatteringinterbandabsorptionandphotoluminescence AT kharatyangorts opticalpropertiesofconicalquantumdotexcitonrelatedramanscatteringinterbandabsorptionandphotoluminescence AT sarkisyanhayka opticalpropertiesofconicalquantumdotexcitonrelatedramanscatteringinterbandabsorptionandphotoluminescence AT mantashyanpaytsara opticalpropertiesofconicalquantumdotexcitonrelatedramanscatteringinterbandabsorptionandphotoluminescence AT baskoutassotirios opticalpropertiesofconicalquantumdotexcitonrelatedramanscatteringinterbandabsorptionandphotoluminescence AT hayrapetyandavidb opticalpropertiesofconicalquantumdotexcitonrelatedramanscatteringinterbandabsorptionandphotoluminescence |