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In situ Ga-catalyzed AlGaAs nanostructures have been grown by MOVPE. The effect of growth temperature on the shape, size, tapering, and spatial distribution of nanostructures has been investigated using the FESEM technique. Micro-PL measurements have been conducted to analyze the optical quality of the nanostructures. Aluminum composition of around 13% has been estimated by multiple peak-fitting of...
We have studied spectral diffusion of excitons in GaAs quantum wells using two-dimensional coherent spectroscopy. Localized and delocalized excitons exhibit distinct spectral diffusion characteristics. These results cannot be explained in the strong redistribution approximation.
2D coherent spectroscopy is used to study exciton-phonon interactions in an InAs quantum dot ensemble. Temperature and size dependent properties of the zero-phonon line and the phonon background in the s- and p-shells are revealed.
Two-dimensional coherent spectroscopy on a series of quantum dot samples with different morphology reveals that biexciton binding is independent of the details of confinement in InAs dots, in contrast to the behavior in GaAs dots.
The frequency-frequency correlation function for excitons in a GaAs quantum well is measured using optical two-dimensional Fourier transform spectroscopy and a numerical fitting procedure. We also report frequency-frequency correlation functions for biexciton and two-exciton states.
We present the molecular beam epitaxial growth of nanocomposites consisting of semimetallic ErAs nanoparticles which are epitaxially embedded within InGaAlAs-based semiconductors. The properties of nanocomposites can be drastically different from that of the constituents, and in this case, the incorporation of ErAs is used to increase the thermoelectric power factor and decrease the lattice thermal...
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