Magnetic field and dielectric environment effects on an exciton trapped by an ionized donor in a spherical quantum dot. (November 2017)

• Record Type: Journal Article
• Authors: Aghoutane, N.; Feddi, E.; El-Yadri, M.; Bosch Bailach, J.; Dujardin, F.; Duque, C.A.
• Is Part Of: Superlattices and microstructures. Volume 111(2017)
• Page Start: 1082
• Page End: 1092
• Publication Date: 2017-11
• Subjects: Quantum dot -- Bound exciton -- Magnetic field -- Haynes' rule; Superlattices as materials -- Periodicals; Microstructure -- Periodicals; Semiconductors -- Periodicals; Superréseaux -- Périodiques; Microstructure (Physique) -- Périodiques; Semiconducteurs -- Périodiques; 621.38152
• DOI: 10.1016/j.spmi.2017.08.014
• Languages: English
• ISSNs: 0749-6036

Abstract

Abstract: Magnetic field and host dielectric environment effects on the binding energy of an exciton trapped by an ionized donor in spherical quantum dot are investigated. In the framework of the effective mass approximation and by using a variational method, the calculations have been performed by developing a robust ten-terms wave function taking into account the different inter-particles correlations and the distortion of symmetry induced by the orientation of the applied magnetic field. The binding and the localization energies are determined as functions of dot size and magnetic field strength. It appears that the variation of magnetic shift obeys a quadratic law for low magnetic fields regime while, for strong magnetic fields, this shift tends to be linear versus the magnetic field strength. The stability of this complex subjected to a magnetic field is also discussed according to the electron-hole ratio and the dielectric constant of the surrounding medium. A last point to highlight is that the Haynes' rule remains valid even in the presence of an applied magnetic field. Highlights: Stability of an exciton bound to an ionized donor in a quantum dot. Influence of the surrounding medium and magnetic field. Conservation of Hayne's law.