Enhancement of the nonlinear acoustoelectric interaction in a photoexcitedplasma in a quantum well

Nonlinear interaction of an intense surface acoustic wave (SAW) with a 2D e lectron-hole plasma generated by light in a semiconductor quantum well near a piezoelectric crystal is investigated. It is shown that, in a strongly n onlinear regime, the acoustoelectric interaction is enhanced because of the accumulation of carriers in the field of an intense SAW. In addition, in a strongly nonlinear regime, the dissipation of the acoustic wave energy inc reases and the sound velocity decreases. These dependences fundamentally di ffer from those observed in a unipolar plasma. For high sound intensities, analytical results are obtained. (C) 2000 MAIK "Nauka/Interperiodica".