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VOLUME 42 (1985) | ISSUE 8 | PAGE 327
Exciton localization in quantum-well structures
Study of the luminescence of structures with quantum wells, whose width is less than the Bohr radius of the exciton, reveals that the excitons localize at fluctuations of the well width. These fluctuations are insular increases of one lattice constant in the thickness of the layer of the narrow-gap material. The luminescence is dominated by islands with a dimension on the order of the exciton diameter.