Le Journal de Physique IV
Volume 03, Numéro C5, Octobre 1993
Third International Conference on Optics of Excitons in Confined
Page(s) C5-367 - C5-372
Third International Conference on Optics of Excitons in Confined

Le Journal de Physique IV 03 (1993) C5-367-C5-372

DOI: 10.1051/jp4:1993577

Stark effect in parabolic quantum dot


1  Département de Physique de l'E.N.S. de Bizerte, 7021 Jarzouna Bizerte, Tunisia
2  Laboratoire de Physique de la Matière Condensée de l'E.N.S. de Paris, 24 rue Lhomond, 75231 Paris cedex 05, France
3  Département de Physique de la Faculté des Sciences de Tunis, Campus Universitaire Le Belvédere Tunis, Tunisia

We theoretically investigate the optical properties of the exciton confined in parabolic quantum-dot, with and without electric field, by means of perturbative-variational method. The quantum-dot size enhances the 1S eigenvalue and oscillator strength. In smaller dot the relative extension of the exciton wave function is equal to the size of the dot. The 1S exciton binding energy is found to be almost 2-3 times that in the quantum-well of the same thickness. In the presence of an external electric field, we calculate the quantum-confined Stark effect . The energy split is found about the same as in quantum-well with the same size. The wider quantum-dot has a larger Stark shift. We also analyse the special case of high electric field. In this case the Coulombic interaction can be approximated by parabolic potential.

© EDP Sciences 1993