Abstract

The ultrafast relaxation dynamics of photoexcited carriers in Ge nanocrystals is here investigated using a pump-and-probe technique, Three different excitation energies (1.59, 3.18, 4.77 eV) are used, and the spectral interval between 1.7 and 2.8 eV is probed. The electron dynamics has been studied and the scattering times have been evaluated, together with their dependence on the pump energy. The transient signal has been interpreted in terms of two main contributions: (i) conduction band filling and (ii) band gap renormalization. A model based on the bulk band structure allows to explain the overall response.

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