The binding energy of the exciton in the symmetric and asymmetric GaAs/Ga1-xAlxAs quantum wells is calculated with the use of a variational approach. Results have been obtained as a function of the potential symmetry, and ...

The effects of an applied electric field on subband energies and excitonic binding for a graded GaAlAs quantum well are calculated variationally within the effective mass approximation. The very sensitive dependence of ...