Ultrafast Spectroscopy on Metastable Bulk and Heterostructure Semiconductor Compounds

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The following relaxation processes of optically excited carriers in metastable semiconductor compounds and their heterostructures are studied by time-resolved spectroscopy: dephasing, thermalization, capture from barriers into quantum wells, cooling, and recombination as well as the spatio-temporal evolution of excitation. Experimental techniques are pump-probe experiments, time-resolved photoluminescence, and eventually four-wave-mixing experiments. The aim is to study in these compounds the influence of the strongly modified conduction band on carrier relaxation where the specific band structure is prepared by the corresponding sample growth and treatment. The experiments will be started with (GaIn)(NAs)/GaAs in the first period but can be expanded to (GaIn)(NP)/GaP in the next period.