Abstract
Low-temperature photoluminescence, photoluminescence excitation, and photoreflectance modulation measurements are used to probe the electronic structure and the dielectric function of (001) ( Gap) 2 ( InP) 2 superlattices (grown on a GaInP 2 buffer) that exhibit lateral composition modulation. An 8×8 Luttinger-model Hamiltonian, which includes the effects of coherency strain generated by the lateral composition modulation, is used to analyze the experimental results. These studies yield the first experimental evidence for a spontaneously generated effective mass superlattice.
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