Comment on ‘‘Radiative recombination processes of the many-body states in multiple quantum wells’’

In our comment on the study of radiative recombination processes by Cingolani et al., we emphasize that lateral transport of a two-component carrier system is very difficult to describe, especially for high carrier densities. To complete the results of Cingolani et al., we give a brief overview of characteristic transport behavior in several temperature ranges for different carrier densities. To explain the observed emission 700 μm apart from the excitation spot we propose waveguiding of recombination light in lateral directions.