Portella-Oberli, M. T.Ciulin, V.Kutrowski, M.Wojtowicz, T.Deveaud, B.2007-08-312007-08-312007-08-31200310.1002/pssb.200303172https://infoscience.epfl.ch/handle/20.500.14299/11506WOS:000184924800025We investigate the nonlinear optical dynamics of excitons and trions in CdTe modulation-doped quantum wells by time and spectrally resolved pump-probe experiments. We find that the nonlinearities induced by excitons are different from those due to the presence of the trions. From a comparison between the exciton and trion behaviours, we show that, at low temperature, trions are formed from excitons in about 10 picoseconds and, as the temperature is increased, a thermal equilibrium is reached between exciton and trion populations within 5 picoseconds.QUANTUM-WELL STRUCTURESBLUE SHIFTDEPENDENCEtext::journal::journal article::research article