Eur. Phys. J. B 56, 303-309 (2007)
https://doi.org/10.1140/epjb/e2007-00136-1

Energy spectra of exciton states in disk-shaped GaAs-Ga_1-xAl_xAs quantum dots under growth-direction magnetic fields

¹ Departamento de Física, Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, Chile
² Instituto de Física, Universidad de Antioquia, AA, 1226 Medellín, Colombia
³ Instituto de Física, Unicamp, CP 6165, 13083-970 Campinas, SP, Brazil

Corresponding author: ^a cduque@fisica.udea.edu.co

Received: 31 October 2006
Revised: 11 April 2007
Published online: 16 May 2007

Abstract

A theoretical study, within the effective-mass approximation, of the effects of applied magnetic fields on excitons in disk-shaped GaAs-Ga_1-xAl_xAs quantum dots is presented. Magnetic fields are applied in the growth direction of the semiconductor heterostructure. The parity of the excitonic envelope function related to the simultaneous exchange of z_e→-z_e and z_h→-z_h is a good quantum number and the wave function, both the odd and even parity, can be expanded as combination of products of the quantum well electron and hole function that preserves the parity with appropriate Gaussian functions. We have simultaneously obtained the energies of the excitonic ground and excited states and discuss the behavior of these energies as a function of the magnetic field.