Abstract
The physics of core excitons in semiconductors is reviewed, with emphasis on the fact that Hjalmarson-Frenkel ‘deep’ core excitons are observed, and co-exist with Wannier-Mott ‘shallow’ excitons which are not normally resolved experimentally. The theory of Hjalmarson-Frenkel excitons is extended to excitons in superlattices, and the Ga3d core exciton in GaAs 1-x P x /GaP strained-layer superlattices is predicted to change from a resonance in the conduction band (with apparent negative binding energy) to a bound state in the gap (positive binding energy), as the GaAs 1-x P x layer thickness decreases.
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