We have carried out an original study of longitudinal photoconductivity (PC) of undoped GaAs/AlGaAs V-grooved quantum wires (QWRs) by measuring the PC along the wire direction. The PC spectrum reveals several peak structures superimposed on a smooth background, the latter being related to the GaAs substrate. Some of these structures are connected with the QWRs. This is confirmed by the observed dependence of the PC spectrum on the exciting light polarization and by comparing this spectrum with photoluminescence and photoluminescence excitation spectra measured on a similar sample. A theoretical identification of the peak structures is given by calculating the optical transition energies of the studied QWRs in frames of the envelope function approximation. An original approach, based on the infrared preillumination of the sample, is proposed to reduce the contribution of the GaAs substrate to the PC, in this way favoring the QWR spectral structures.
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