We have investigated photoreflectance and reflectance line shapes of heavy-hole and light-hole excitons with quantum number n =1 at 77 K in (GaAs) m /(AlAs) m superlattices ( m =35 and 53 monolayers) grown by molecular-beam epitaxy. The photoreflectance and reflectance line shapes of the superlattice with m =53 are fully reversed to those of the superlattice with m =35. It is demonstrated that the difference of the photoreflectance line shapes is due to a Fabry-Perot-type interference effect causing the difference of the reflectance line shapes.
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Nakayama et al. (1990) studied this question.
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