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

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Lisauskas A., Blöser C., Sachs R., Roskos H., Juozapavičius A., Valušis G., Köhler K.

Acta Physica Polonica A

2005

vol. 107

issue 2

250-255

We apply time-resolved photocurrent and differential electroreflectance spectroscopy to study the evolution of the internal field in a GaAs/AlGaAs superlattice after pulsed optical excitation at low temperature. The electric field 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 information about the carrier and field dynamics.

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1 Acta Physica Polonica A

1 2005

1 Blöser C.

1 Juozapavičius A.

1 Köhler K.

1 Lisauskas A.

1 Roskos H.

1 Sachs R.

1 Valušis G.

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