Abstract
In this work we present results on photoconductivity and non-steady-state photoelectromotive force (PEMF) currents in multiple photorrefractive quantum wells (PRQW) of GaAs/AlGaAs in longitudinal configuration under dc applied electric fields EQ. Velocity saturation and negative differential resisitivity are observed on the photoconductivity and therefore in the PEMF current. We also observe that the peak of the PEMF signal (which occurs at modulation frequency equal to the inverse of the dielectric relation time) is independent of the applied field for E0<11.3 kV/cm.
© 2001 Optical Society of America
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