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ELECTRIC FIELD EFFECTS ON THE EXCITON BOUND TO AN IONIZED DONOR IN PARABOLIC QUANTUM WELLS

E. C. Niculescu1,* , L. Burileanu1, I. Sndulescu1

Affiliation

  1. Department of Physics, “Politehnica” University of Bucharest, 313 Splaiul Independentei, RO-77206 Bucharest, Romania

Abstract

Using a perturbation-variational procedure within the effective-mass approximation we investigate the ground-state properties of an exciton bound to an ionized donor in a parabolic quantum well under the action of the electric field. We used a screened potential for the hole-ionized donor interaction and we calculated the binding energy as a function of the electric field, the donor-impurity position and the screening parameter. We found that the presence of the electric field breaks down the degeneracy of states for the impurities symmetrically positioned in the well, and together with the screened potential effect is determinant for the existence of bound states in these structures..

Keywords

Parabolic quantum well, Bound exciton, electric field, Binding energy.

Submitted at: July 1, 2005
Accepted at: Sept. 22, 2005

Citation

E. C. Niculescu, L. Burileanu, I. Sndulescu, ELECTRIC FIELD EFFECTS ON THE EXCITON BOUND TO AN IONIZED DONOR IN PARABOLIC QUANTUM WELLS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 5, pp. 2775-2782 (2005)