The effects of temperature, hydrostatic pressure and size on optical gain for GaAs spherical quantum dot laser with hydrogen impurity
| Autor: | Alireza Keshavarz, Hosein Mokhtari, Erfan Owji |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Valence (chemistry) Materials science Condensed matter physics Band gap Hydrostatic pressure 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Redshift Effective mass (solid-state physics) Quantum dot laser Quantum dot 0103 physical sciences General Materials Science Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Superlattices and Microstructures. 98:276-282 |
| ISSN: | 0749-6036 |
| DOI: | 10.1016/j.spmi.2016.08.037 |
| Popis: | In this paper, the effects of temperature, hydrostatic pressure and size on optical gain for GaAs spherical quantum dot laser with hydrogen impurity are investigated. For this purpose, the effects of temperature, pressure and quantum dot size on the band gap energy, effective mass, and dielectric constant are studied. The eigenenergies and eigenstates for valence and conduction band are calculated by using Runge-Kutta numerical method. Results show that changes in the temperature, pressure and size lead to the alteration of the band gap energy and effective mass. Also, increasing the temperature redshifts the optical gain peak and at special temperature ranges lead to increasing or decreasing of it. Further, by reducing the size, temperature-dependent of optical gain is decreased. Additionally, enhancing of the hydrostatic pressure blueshifts the peak of optical gain, and its behavior as a function of pressure which depends on the size. Finally, increasing the radius rises the redshifts of the peak of optical gain. |
| Databáze: | OpenAIRE |
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