Ultrafast pump-probe dynamics in ZnSe-based semiconductor quantum-wells

Details Ultrafast pump-probe dynamics in ZnSe-based semiconductor quantum-wells Ultrafast pump-probe dynamics in ZnSe-based semiconductor quantum-wells

2008-07-19

arxiv.org/abs/0807.3092v1

Journal of the Optical Society of America B, Vol. 19, pp. 2022-2031 (2002)

Physics

Condensed Matter

Materials Science

10 pages, 9 figures. Key words: nonlinear and ultrafast optics, modeling of femtosecond pump-probe experiments, electron spin-

Scientific paper

10.1364/JOSAB.19.002022

Pump-probe experiments are used as a controllable way to investigate the properties of photoexcited semiconductors, in particular, the absorption saturation. We present an experiment-theory comparison for ZnSe quantum wells, investigating the energy renormalization and bleaching of the excitonic resonances. Experiments were performed with spin-selective excitation and above-bandgap pumping. The model, based on the semiconductor Bloch equations in the screened Hartree-Fock approximation, takes various scattering processes into account phenomenologically. Comparing numerical results with available experimental data, we explain the experimental results and find that the electron spin-flip occurs on a time scale of 30 ps.

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