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We apply time-resolved photocurrent and difierential electrore∞ectance spectroscopy to study the evolution of the internal fleld in a GaAs/AlGaAs superlattice after pulsed optical excitation at low temperature. The elec- tric fleld dynamics is investigated by tracing the spectral position of the Wannier{Stark transitions as a function of delay time. We determine the electron sweep-out time, extract detailed information about the picosecond- -time-scale drift of the charge carriers by comparing the measured data with the results of semi-classical self-consistent model calculations, and evaluate the two experimental techniques with respect to their ability to provide in- formation about the carrier and fleld dynamics.

acta physica polonica. a

Dynamics of the Electric Field in a GaAs/AlGaAs Superlattice after Femtosecond Optical Excitation: Application of Time-Resolved Spectroscopic Techniques