Optical properties of Ga_(1-x)In_xAs/GaAs(001) quantum well superlattices: Exciton and polariton dispersion curves

摘要

Wannier exciton wavefunctions and energies have been computed in superlattices of strained Ga_(1-x)In_xAs/GaAs(001) quantum wells (SLQWs) using Luttinger Hamiltonian and accurate variational envelope functions. Exciton dispersion curves of the SLQWs are then obtained by computing exciton energies for different K-points of the corresponding first Brillouin zone. Photon dispersion curves, due to the background dielectric constant modulation, and the polariton dispersion curves have been computed in the semiclassical self-consistent framework. The results are discussed for the case of exciton energies far from the photonic gaps.