Detail publikace

Adjustment of Terahertz Properties Assigned to the First Lowest Transition of (D+, X) Excitonic Complex in a Single Spherical Quantum Dot Using Temperature and Pressure

Aghoutane, N., Perez, LM.Tiutiunnyk, A. Laroze, D. Baskoutas, S. Durajdin, F. El Fatimy, A. El-Yadri, M. Feddi, E.

Originální název

Adjustment of Terahertz Properties Assigned to the First Lowest Transition of (D+, X) Excitonic Complex in a Single Spherical Quantum Dot Using Temperature and Pressure

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

This theoretical study is devoted to the effects of pressure and temperature on the optoelectronic properties assigned to the first lowest transition of the (D+, X) excitonic complex (exciton-ionized donor) inside a single AlAs/GaAs/AlAs spherical quantum dot. Calculations are performed within the effective mass approximation theory using the variational method. Optical absorption and refractive index as function of the degree of confinement, pressure, and temperature are investigated. Numerical calculation shows that the pressure favors the electron-hole and electronionized donor attractions which leads to an enhancement of the binding energy, while an increasing of the temperature tends to reduce it. Our investigations show also that the resonant peaks of the absorption coefficient and the refractive index are located in the terahertz region and they undergo a shift to higher (lower) therahertz frequencies when the pressure (temperature) increases. The opposite effects caused by temperature and pressure have great practical importance because they offer an alternative approach for the adjustment and the control of the optical frequencies resulting from the transition between the fundamental and the first excited state of exciton bound to an ionized dopant. The comparison of the optical properties of exciton, impurity and (D+, X) facilitates the experimental identification of these transitions which are often close. Our investigation shows that the optical responses of (D+, X) are located between the exciton (high energy region) and donor impurity (low energy region) peaks. The whole of these conclusions may lead to the novel light detector or source of terahertz range.

Klíčová slova

terahertz properties; quantum dots; (D+, X) complex; temperature; pressure

Autoři

Aghoutane, N., Perez, LM.;Tiutiunnyk, A.; Laroze, D.; Baskoutas, S.; Durajdin, F.; El Fatimy, A.; El-Yadri, M.; Feddi, E.

Vydáno

1. 7. 2021

Nakladatel

MDPI

Místo

BASEL

ISSN

2076-3417

Periodikum

Applied Sciences - Basel

Ročník

11

Číslo

13

Stát

Švýcarská konfederace

Strany od

5969-1

Strany do

5969-12

Strany počet

12

URL