Abstract

An IR photoreflectance (PR) study of two-dimensional nanoheterostructures based on InSb was performed by using Fourier-transform IR photomodulation spectroscopy. The studied structures, including $\mathrm{InSb}/{\mathrm{Al}}_x{\mathrm{In}}_{1-x}\mathrm{Sb}$ quantum wells (QWs) and type-II nanostructures with monolayer-thick InSb insertions within bulk InAs layers, were grown via molecular beam epitaxy on GaAs (001) and InAs (001) substrates, respectively. The PR spectra of the $\mathrm{InSb}/{\mathrm{Al}}_x{\mathrm{In}}_{1-x}\mathrm{Sb}$ heterostructures exhibited a series of signals from the QWs, including the spin-orbit split band, as well as the ${\mathrm{Al}}_x{\mathrm{In}}_{1-x}\mathrm{Sb}$ layers, which enabled control of the barrier height and composition. A comparison of the experimental results with calculations made by the effective mass approximation technique was used to identify several optical transitions observed within the QWs, including those related to the excited states not visible in the photoluminescence spectra. For the InSb/InAs monolayer nanostructures, an analysis of the PR spectra features allowed for determination of their energy spectrum, internal electric field value, and localization energy of holes up to room temperature.

© 2019 Optical Society of America

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