MODULATED REFLECTANCE AND RESONANT RAMAN-SCATTERING OF GAAS QUANTUM WIRES GROWN ON NONPLANAR SUBSTRATES

Modulated reflectance spectroscopy and resonant Raman scattering have been used to study the quantized states of crescent-shaped GaAs quantu m wires. Distinct one-dimensional excitonic transitions originating fr om the quantum wires together with the expected resonances from the be nt quantum wells are observed. The quantum wire transition energies co mpare very well with those calculated using a V-shaped potential deriv ed from transmission electron microscopy measurements of the lateral v ariation of the GaAs well width. The spectroscopic techniques employed here provide alternative methods of probing the confined states in qu antum wires of low luminescence efficiency.