Negative photoconductivity caused by ‘‘carrier drag’’ is experimentally verified for the first time. In p-modulation-doped GaAs/AlGaAs quantum wells carrier drag, leading to ‘‘negative absolute mobility’’ of injected minority electrons, results in a decrease of the total in-plane current in the quantum wells. The temperature dependence of the measured differential photoconductivity quantitatively agrees with the expected behavior due to the effect of electron-hole scattering.
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Juen et al. (1989) studied this question.
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