Okuno, T.Ikezawa, M.Masumoto, Y.Hayes, G. R.Deveaud, B.Lipovskii, A. A.2007-08-312007-08-312007-08-31200310.1143/JJAP.42.L123https://infoscience.epfl.ch/handle/20.500.14299/11508WOS:0001811612000133260Intraband transitions around 1.5 mum are studied in PbSe quantum dots at room temperature. Femtosecond pump-probe measurements reveal induced absorption by photoexcited carriers up to higher energy levels and its relaxation. A dominant decay component has a decay time of 10-40 ps, which is determined by the relaxation of carriers at the lowest absorption peak. The induced absorption is observed in a broad spectral range between 0.77 and 2.5 eV.intraband transitionsquantum dotsinduced absorptionpump-probemeasurementPbSestrong confinementPHOSPHATE-GLASSMU-MABSORPTIONRELAXATIONMATRIXWELLStext::journal::journal article::research article