EXCITON IN 2D CUBIC INCLUSION IN HEXAGONAL GAN

An inclusion of cubic GaN in an otherwise hexagonal matrix is consider ed to be equivalent to an effective quantum well. The exciton binding energy in a quantum well of a finite potential barrier height in the c onduction and valence bands is calculated in the effective mass approx imation with a variational envelope function type of Bastard and Takag ahara. The exciton binding energy and the energy of exciton recombinat ion line are computed, as a function of the well width, for realistic potential barrier heights and band-offset ratios.