Modulation Spectroscopies on a GaAs/InAs/GaAs Single-Monolayer Structure

Abstract
Piezoreflectance, photoreflectance and reflectivity measurements have been performed on a sample consisting of one InAs monomolecular plane in bulklike GaAs grown by atomic layer molecular beam epitaxy. The heavy-hole and light-hole characteristics of the two excitonic InAs-related transitions observed are experimentally elucidated for the first time. The electric field modulation observed in the photoreflectance spectra of such a heterostrvcture cannot be attributed to the quantum-confined Stark effect.