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The subband structure of a two-dimensional electron system at a GaAs/Al x Ga 1- x As heterojunction interface is calculated. Many-body exchange and correlation effects are taken into account in the local density-functional approximation. They are shown to be unimportant but not negligibly small. Spectra of light scatterings are also calculated. Results are in reasonable agreement with existing experiments.
Tsuneya Ando (Wed,) studied this question.