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...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-04-01
|
| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/13/8/1393 |
| _version_ | 1797604061527146496 |
|---|---|
| author | Sargis P. Gavalajyan Grigor A. Mantashian Gor Ts. Kharatyan Hayk A. Sarkisyan Paytsar A. Mantashyan Sotirios Baskoutas David B. Hayrapetyan |
| author_facet | Sargis P. Gavalajyan Grigor A. Mantashian Gor Ts. Kharatyan Hayk A. Sarkisyan Paytsar A. Mantashyan Sotirios Baskoutas David B. Hayrapetyan |
| author_sort | Sargis P. Gavalajyan |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-11T04:40:51Z |
| format | Article |
| id | doaj.art-ec74ba3328c946e3a3ad4d19ac8cf647 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-11T04:40:51Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-ec74ba3328c946e3a3ad4d19ac8cf6472023-11-17T20:43:51ZengMDPI AGNanomaterials2079-49912023-04-01138139310.3390/nano13081393Optical Properties of Conical Quantum Dot: Exciton-Related Raman Scattering, Interband Absorption and PhotoluminescenceSargis P. Gavalajyan0Grigor A. Mantashian1Gor Ts. Kharatyan2Hayk A. Sarkisyan3Paytsar A. Mantashyan4Sotirios Baskoutas5David B. Hayrapetyan6Department of General Physics and Quantum Nanostructures, Russian-Armenian University, 123 Hovsep Emin Str., Yerevan 0051, ArmeniaDepartment of General Physics and Quantum Nanostructures, Russian-Armenian University, 123 Hovsep Emin Str., Yerevan 0051, ArmeniaDepartment of General Physics and Quantum Nanostructures, Russian-Armenian University, 123 Hovsep Emin Str., Yerevan 0051, ArmeniaDepartment of General Physics and Quantum Nanostructures, Russian-Armenian University, 123 Hovsep Emin Str., Yerevan 0051, ArmeniaDepartment of General Physics and Quantum Nanostructures, Russian-Armenian University, 123 Hovsep Emin Str., Yerevan 0051, ArmeniaDepartment of Materials Science, University of Patras, 265 04 Patras, GreeceDepartment of General Physics and Quantum Nanostructures, Russian-Armenian University, 123 Hovsep Emin Str., Yerevan 0051, ArmeniaThe 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.https://www.mdpi.com/2079-4991/13/8/1393conical quantum dotexcitonRaman scatteringinterband absorptionphotoluminescence |
| spellingShingle | Sargis P. Gavalajyan Grigor A. Mantashian Gor Ts. Kharatyan Hayk A. Sarkisyan Paytsar A. Mantashyan Sotirios Baskoutas David B. Hayrapetyan Optical Properties of Conical Quantum Dot: Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence Nanomaterials conical quantum dot exciton Raman scattering interband absorption 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 | conical quantum dot exciton Raman scattering interband absorption photoluminescence |
| url | https://www.mdpi.com/2079-4991/13/8/1393 |
| work_keys_str_mv | AT sargispgavalajyan opticalpropertiesofconicalquantumdotexcitonrelatedramanscatteringinterbandabsorptionandphotoluminescence AT grigoramantashian opticalpropertiesofconicalquantumdotexcitonrelatedramanscatteringinterbandabsorptionandphotoluminescence AT gortskharatyan opticalpropertiesofconicalquantumdotexcitonrelatedramanscatteringinterbandabsorptionandphotoluminescence AT haykasarkisyan opticalpropertiesofconicalquantumdotexcitonrelatedramanscatteringinterbandabsorptionandphotoluminescence AT paytsaramantashyan opticalpropertiesofconicalquantumdotexcitonrelatedramanscatteringinterbandabsorptionandphotoluminescence AT sotiriosbaskoutas opticalpropertiesofconicalquantumdotexcitonrelatedramanscatteringinterbandabsorptionandphotoluminescence AT davidbhayrapetyan opticalpropertiesofconicalquantumdotexcitonrelatedramanscatteringinterbandabsorptionandphotoluminescence |