Archivio Istituzionale della RicercaCoherent nonlinear polarizations and non-equilibrium distributions of hot electrons are studied on femtosecond experiments with bulk GaAs. Both excitonic and free-carrier components contribute to the third-order polarization close to the bandgap and shows a distincly different time behavior. Phase relaxation during the femtosecond photogeneration process leads to a significant broadening of the initial carrier distribution in comparison to the power spectrum of the optical pulses. The experimental results are in excellent agreement with a Monte Carlo solution of thesemiconductor Bloch equations.
Ultrafast dynamics of electronic excitations in semiconductors / Elsaesser, T.; Leitenstorfer, A.; Kuhn, T.; Rossi, Fausto. - In: PROGRESS IN CRYSTAL GROWTH AND CHARACTERIZATION OF MATERIALS. - ISSN 0960-8974. - 33:1-3(1996), pp. 41-48. [10.1016/0960-8974(96)83611-4]
Ultrafast dynamics of electronic excitations in semiconductors
ROSSI, FAUSTO
1996
Abstract
Coherent nonlinear polarizations and non-equilibrium distributions of hot electrons are studied on femtosecond experiments with bulk GaAs. Both excitonic and free-carrier components contribute to the third-order polarization close to the bandgap and shows a distincly different time behavior. Phase relaxation during the femtosecond photogeneration process leads to a significant broadening of the initial carrier distribution in comparison to the power spectrum of the optical pulses. The experimental results are in excellent agreement with a Monte Carlo solution of thesemiconductor Bloch equations.
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https://hdl.handle.net/11583/2498593
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