Green’s-function approach to the electronic structure of double-barrier quantum-well heterostructures

The scattering-theoretic Green’s-function method incorporated with band structures, which takes into account the indirect band gap, the band nonparabolicity, and the multiorbital and external-bias effect, is used to study AlAs/GaAs/AlAs double-barrier quantum-well structures in a [001] direction. The calculated spectral local density of states simultaneously exhibits confined states originating from both the quantum-well Γ valley and the barrier X valley. The calculated energies of confined quantum-well electron states and light-hole states are compared with the reported photoluminescence-excitation experimental data.