Polaronic mass and non-parabolicity effects on the photoionization cross section of an impurity in a double quantum dot

• Published in: Superlattices and microstructures Vol. 159; p. 107049
• Main Authors: Arraoui, R., Sali, A., Ed-Dahmouny, A., Jaouane, M., Fakkahi, A.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2021
• Subjects: Donor binding energy; Non-parabolicity; Parabolic band; Photoionization cross section; Polaronic mass; Symmetrical double quantum dot; Photoionization cross section; Non-parabolicity; Donor binding energy; Polaronic mass; Parabolic band; Symmetrical double quantum dot
• ISSN: 0749-6036; 1096-3677
• DOI: 10.1016/j.spmi.2021.107049

This manuscript focused on the effect of the non-parabolicity and the polaronic mass on the optical and electronic properties in the GaAs−Ga1−xAlxAs symmetrical double quantum dot (SDQD) of a donor impurity by using the variational method within the effective mass approximation. In this work, we focused our studies on the variation of the binding energy (Eb) and the photoionization cross section (PICS) as a function of the photon energy, the system size (Lb,Ld) and the impurity position (xi/Lc). Our major results show that the Eb and the PICS are greatly dependent on the location of the impurity in the SDQD and they are affected by the non-parabolicity effect for strong confinement and by the polaronic mass effect for weak confinement. Furthermore, the modifications in the impurity position, system size, and aluminum concentration can induce a red or blue shift in the resonant peaks of the photoionization cross section. •The binding energy (Eb) and the photoionization cross section (PICS) depend strongly on the location of the impurity in the GaAs−Ga1−xAlxAs symmetrical double quantum dot.•Eb increases with the presence of non-parabolicity effect as well as combined effect of non-parabolicity and polaronic mass.•Both effects of the non-parabolicity as well as the combined effect of the non-parabolicity & the polaronic mass result in a blue shift in the resonance peak of the PICS.•The Eb and the PICS are affected by the non-parabolicity effect for strong confinement and by the polaronic mass effect for weak confinement.