Abstract
Two size-dependent photoluminescence peaks are observed for GaAs quantum wires naturally formed on vicinal GaAs(1 1 0) surfaces with giant steps by molecular beam epitaxy. These two peaks are found to have different activation energies from the temperature dependence of these peaks. Monochromatic CL images shows the formation of two group of quantum wires with different size. Excitation intensity dependence of relative intensities of these peaks indicates no thermalization between these two group of wires.
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