التفاصيل البيبلوغرافية
| العنوان: |
Electric field effect on the photoionization cross section of a single dopant in a strained AlAs/GaAs spherical core/shell quantum dot. |
| المؤلفون: |
M'zerd, S., El Haouari, M., Aghoutane, M., El-Yadri, M., Feddi, E., Dujardin, F., Zorkani, I., Jorio, A., Sadoqi, M., Long, G. |
| المصدر: |
Journal of Applied Physics; 2018, Vol. 124 Issue 16, pN.PAG-N.PAG, 8p, 1 Diagram, 1 Chart, 10 Graphs |
| مصطلحات موضوعية: |
ELECTRIC fields, PHOTOIONIZATION, GALLIUM arsenide, NUCLEAR cross sections, DOPING agents (Chemistry), ALUMINUM arsenide |
| مستخلص: |
This paper reports a recent study on the polarizability and the photoionization cross section (PCS) of a hydrogenic impurity confined in a spherical A l A s / G a A s core/shell quantum dot under external electric field and hydrostatic pressure. In the framework of effective mass theory, a variational approach is used to determine the polarizability, binding energy, and the PCS of a single donor in a spherical core/shell quantum dot. Our numerical calculations reveal that all these fundamental parameters are deeply dependent on the core and shell radii. The study of the localization of the impurity inside the core/shell indicates that the Stark shift is more important when the impurity is positioned at the center of the core/shell and becomes less important when the donor moves toward the boundaries of the shell layer. In addition, a rapid decrease of the intensity of electric polarizability under hydrostatic pressure is observed. In order to understand the optical responses during the photoionization of the donor dopant, we investigated the PCS under hydrostatic pressure, electric field, ionized donor position, and core/shell sizes. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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