Non-Linear Optical Properties of Biexciton in Ellipsoidal Quantum Dot
We have presented a theoretical investigation of exciton and biexciton states for the ground and excited levels in a strongly oblate ellipsoidal quantum dot made from GaAs. The variational trial wave functions for the ground and excited states of the exciton and biexciton are constructed on the base...
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MDPI AG
2022-04-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/9/1412 |
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| author | Yuri Y. Bleyan Paytsar A. Mantashyan Eduard M. Kazaryan Hayk A. Sarkisyan Gianluca Accorsi Sotirios Baskoutas David B. Hayrapetyan |
| author_facet | Yuri Y. Bleyan Paytsar A. Mantashyan Eduard M. Kazaryan Hayk A. Sarkisyan Gianluca Accorsi Sotirios Baskoutas David B. Hayrapetyan |
| author_sort | Yuri Y. Bleyan |
| collection | DOAJ |
| description | We have presented a theoretical investigation of exciton and biexciton states for the ground and excited levels in a strongly oblate ellipsoidal quantum dot made from GaAs. The variational trial wave functions for the ground and excited states of the exciton and biexciton are constructed on the base of one-particle wave functions. The energies for the ground and excited levels, depending on the ellipsoidal quantum dot’s geometrical parameters, are depicted in the framework of the variational method. The oscillator strength of the transition from exciton to biexciton states for ground and excited levels is investigated as a function of the ellipsoidal quantum dot’s small and large semiaxes. The third-order optical susceptibilities of ground and excited biexcitons around one-photon and two-photon resonances are calculated as a function of the photon energy. The dependences of third-order optical susceptibilities for the ground and excited levels on the photon energy for different values of the ellipsoidal quantum dot’s semiaxis are revealed. The absorption coefficients in the ellipsoidal quantum dot, both for ground and excited states of exciton and biexciton, are calculated. The absorption coefficients for the ground level of exciton and biexciton for the fixed value of the large semiaxis and for the different values of the small semiaxis are determined. Finally, the two-photon absorption coefficient of the biexciton in the GaAs ellipsoidal quantum dot is computed. |
| first_indexed | 2024-03-10T03:52:23Z |
| format | Article |
| id | doaj.art-11f30ed1b81f4f5aa6fc95b4c595db54 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T03:52:23Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-11f30ed1b81f4f5aa6fc95b4c595db542023-11-23T08:53:48ZengMDPI AGNanomaterials2079-49912022-04-01129141210.3390/nano12091412Non-Linear Optical Properties of Biexciton in Ellipsoidal Quantum DotYuri Y. Bleyan0Paytsar A. Mantashyan1Eduard M. Kazaryan2Hayk A. Sarkisyan3Gianluca Accorsi4Sotirios Baskoutas5David B. Hayrapetyan6Department of General Physics and Quantum Nanostructures, Russian-Armenian University, Yerevan 0051, ArmeniaDepartment of General Physics and Quantum Nanostructures, Russian-Armenian University, Yerevan 0051, ArmeniaDepartment of General Physics and Quantum Nanostructures, Russian-Armenian University, Yerevan 0051, ArmeniaDepartment of General Physics and Quantum Nanostructures, Russian-Armenian University, Yerevan 0051, ArmeniaCNR NANOTEC, Institute of Nanotechnology, University Campus Ecotekne, 73100 Lecce, ItalyDepartment of Materials Science, University of Patras, 265 04 Patras, GreeceDepartment of General Physics and Quantum Nanostructures, Russian-Armenian University, Yerevan 0051, ArmeniaWe have presented a theoretical investigation of exciton and biexciton states for the ground and excited levels in a strongly oblate ellipsoidal quantum dot made from GaAs. The variational trial wave functions for the ground and excited states of the exciton and biexciton are constructed on the base of one-particle wave functions. The energies for the ground and excited levels, depending on the ellipsoidal quantum dot’s geometrical parameters, are depicted in the framework of the variational method. The oscillator strength of the transition from exciton to biexciton states for ground and excited levels is investigated as a function of the ellipsoidal quantum dot’s small and large semiaxes. The third-order optical susceptibilities of ground and excited biexcitons around one-photon and two-photon resonances are calculated as a function of the photon energy. The dependences of third-order optical susceptibilities for the ground and excited levels on the photon energy for different values of the ellipsoidal quantum dot’s semiaxis are revealed. The absorption coefficients in the ellipsoidal quantum dot, both for ground and excited states of exciton and biexciton, are calculated. The absorption coefficients for the ground level of exciton and biexciton for the fixed value of the large semiaxis and for the different values of the small semiaxis are determined. Finally, the two-photon absorption coefficient of the biexciton in the GaAs ellipsoidal quantum dot is computed.https://www.mdpi.com/2079-4991/12/9/1412oblate ellipsoidal quantum dotexcitonbiexcitonthird-order susceptibilitytwo-photon absorption |
| spellingShingle | Yuri Y. Bleyan Paytsar A. Mantashyan Eduard M. Kazaryan Hayk A. Sarkisyan Gianluca Accorsi Sotirios Baskoutas David B. Hayrapetyan Non-Linear Optical Properties of Biexciton in Ellipsoidal Quantum Dot Nanomaterials oblate ellipsoidal quantum dot exciton biexciton third-order susceptibility two-photon absorption |
| title | Non-Linear Optical Properties of Biexciton in Ellipsoidal Quantum Dot |
| title_full | Non-Linear Optical Properties of Biexciton in Ellipsoidal Quantum Dot |
| title_fullStr | Non-Linear Optical Properties of Biexciton in Ellipsoidal Quantum Dot |
| title_full_unstemmed | Non-Linear Optical Properties of Biexciton in Ellipsoidal Quantum Dot |
| title_short | Non-Linear Optical Properties of Biexciton in Ellipsoidal Quantum Dot |
| title_sort | non linear optical properties of biexciton in ellipsoidal quantum dot |
| topic | oblate ellipsoidal quantum dot exciton biexciton third-order susceptibility two-photon absorption |
| url | https://www.mdpi.com/2079-4991/12/9/1412 |
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