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We present a theoretical investigation of space separated electron and holedistributions, which consists in the self-consistent solving of the Schrodingerequations for electrons and holes and the Poisson equation. The results areillustrated for the GaN/Al0.3Ga0.7N quantum well. The optical gain spectrum ina [0001]-oriented GaN/Al0.3Ga0.7N quantum well in the ultraviolet region iscalculated. It is found that both the matrix elements of optical transitionsfrom the heavy hole band and the optical gain spectrum have only the strict x(or y) light polarization. We present studies of the influence of theconfinement of wave functions on the optical gain which implicitly depends onthe built-in electric field calculated to be 2.3 MV/cm. Whereas the structureswith narrow well widths exhibit the usual development of the light gain maximumalmost without shifting the spectral region, a significant blueshift of thegain maximum is found with increase in the plasma density for wider quantumwells. This blueshift is ascribed to the interplay between the screening of astrain-induced piezoelectric field and the bandstructure. A large Sommerfeld orCoulomb enhancement is present in the quantum well.

Optical polarization anisotropy, intrinsic Stark effect and Coulomb  effects on the lasing characteristics of [0001]-oriented GaN/Al0.3Ga0.7N  quantum wells