We have investigated polarization-dependent photoluminescence in InP/InAs/InP quantum wires directly formed on the top of InP substrates. With excitation laser intensity we have observed an anomalously large blueshift of the photoluminescence peak using a cw laser with extremely low intensities. We have also observed evidence of band-gap renormalization. In addition, we have measured two-photon luminescence spectra and confirmed their dependence on photoluminescence polarization.
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Mu et al. (2001) studied this question.
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