Effect of disorder on the temperature dependence of radiative lifetimes   in V-groove quantum wires
  We have studied the effect of disorder on the radiative properties of semiconductor quantum wires by time-resolved photoluminescence spectroscopy. The dependence of the radiative lifetimes is measured over a temperature range extending from 8 to 150 K. At low temperatures we find that the measured dependence does not conform to the theoretical prediction for recombination of free excitons in a quasi one-dimensional system due to the major influence of disorder. An extension of the theory is developped in order to take into account exciton ionization and the contribution of free carriers. A mean localization length for excitons is also estimated from the radiative lifetime at 8 K. 
D. Y. Oberli, M.-A. Dupertuis, F. Reinhardt, E. Kapon