Electric field effect on the intraband optical absorption spectra in of the lens-shaped quantum dots
Keywords:
lens-shaped quantum dot, ellipsoidal quantum dot, absorption coefficientAbstract
The study investigates the influence of an electric field on the energies, oscillator strengths, and absorption coefficients of intraband quantum transitions of an electron in lens-shaped quantum dots. The problem was solved within the framework of the effective mass approximation for two models of lens-shaped quantum dots: a spherical segment and a hemiellipsoid. For both models, the research was conducted using the finite element method in the COMSOL Multiphysics system. Additionally, for the second quantum dot model, exact solutions of the Schrödinger equation were obtained, based on which the influence of the electric field was studied using the diagonalization method. It was shown that the energies and oscillator strengths of intraband quantum transitions obtained by different methods and for different models of lens-shaped quantum dots coincide with high accuracy.
References
1. Holovatsky V., Chubrei M., Yurchenko O. (2021) Impurity Photoionization Cross-Section and Intersubband Optical Absorption Coefficient in Multilayer Spherical Quantum Dots. Phys Chem solid state. 4 (4), 630 – 637.
2. Holovatsky V., Holovatskyi I., Yakhnevych M. (2018) Joint effect of electric and magnetic field on electron energy spectrum in spherical nanostructure ZnS/CdSe/ZnS. Phys E Low-Dimensional Syst Nanostructures. 104, 58 – 63.
3. Holovatsky V., Chubrei M., Duque C. (2022) Core-shell type-II spherical quantum dot under externally applied electric field. Thin Solid Films. 747, 139142.
4. Holovatsky V., Holovatska N., Chubrei M. (2021) Optical absorption, photoionization and binding energy of shallow donor impurity in spherical multilayered quantum dot. Proceedings of SPIE – The International Society for Optical Engineering. 12126, 1212603. doi:10.1117/12.2614673
5. Gurioli M., Wang Z., Rastelli A., Kuroda T., Sanguinetti S. (2019) Droplet epitaxy of semiconductor nanostructures for quantum photonic devices. Nat Mater. 18 (8), 799 – 810.
6. Nemcsics A. Quantum Dots Prepared by Droplet Epitaxial Method. In: Quantum Dots – Theory and Applications. InTech; 2015:119 – 148. doi:10.5772/60823
7. Li R., Liu F., Lu Q. (2023) Quantum Light Source Based on Semiconductor Quantum Dots: A Review. Photonics. 10 (6), 639.
8. Lorenzi B, Chen G. (2018) Theoretical efficiency of hybrid solar thermoelectric-photovoltaic generators. J Appl Phys., 124 (2), 0 – 13.
9. Urban JJ. (2015) Prospects for thermoelectricity in quantum dot hybrid arrays. Nat Publ Gr. 10 (12), 997 – 1001.
10. Wu S. (2021) Anisotropic exciton Stark shift in hemispherical quantum dots. Chinese Phys B. 30 (5), 053201.
11. Lopez Gondar J., Costa B., Trallero-Giner C., Marques G. (2002) Zeeman Effect in Self-Assembled Quantum Dots. Phys status solidi. 230 (2), 437 – 442.
12. Holovatsky, V. A., Holovatskyi, I. V., & Duque, C. A. (2024). Electric field effect on the absorption coefficient of hemispherical quantum dots. Molecular Crystals and Liquid Crystals, 1 – 11.
13. Cantele G., Ninno D., Iadonisi G. (2000) Confined states in ellipsoidal quantum dots. J Phys Condens Matter. 12 (42), 9019 – 9036.
14. Cantele G., Ninno D., Iadonisi G. (2001) Calculation of the Infrared Optical Transitions in Semiconductor Ellipsoidal Quantum Dots. Nano Lett. 1 (3), 121 – 124.
15. Hértilli S., Yahyaoui N., Zeiri N., Baser P., Said M., Saadaoui S. (2024) Theoretical modeling of nonlinear optical properties in spheroidal CdTe/ZnTe core/shell quantum dot embedded in various dielectric matrices. Results Phys. 56.
