Abstract
Photoluminescence spectra of MBE-grown (GaAs) 12 (AlAs) 12 superlattices under high pressure and low temperature are measured. Two main emission bands are observed. The higher emission band behaves like a \(\varGamma\)-edge under pressure; the lower emission band, on the other hand, behaves like an X -edge. This result shows that the \(\varGamma-X\) crossover occurs beyond the twelfth layers in (GaAs) m (AlAs) m superlattices.
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