Hydrostatic Pressure and Magnetic Field Effects on the Exciton States in Vertically Coupled GaAs-(Ga,Al)As Quantum Dots

Abstract

The variational procedure, in the efiective-mass and parabolic-band approxima- tions, is used in order to investigate the combined efiects of hydrostatic pressure and in-plane- direction-applied magnetic fleld on the exciton states in vertically coupled GaAs-(Ga,Al) As quantum dots. Calculations are performed for two cylindrical-shape quantum dots. The exciton envelope wave function is obtained through a variational procedure using a hydrogenic 1s-like wave function and an expansion in a complete set of trigonometric functions for the electron and hole wave functions. The anticrossing efiects on the dispersion with applied magnetic fleld and hydrostatic pressure of the photoluminescence peaks associated with direct and indirect excitons have been considered.