DYNAMIC INTERACTION OF BULK ACOUSTIC-WAVES WITH A 2-DIMENSIONAL ELECTRON-GAS AT AN ALXGA1-XAS GAAS HETEROJUNCTION IN STRONG MAGNETIC-FIELDS/

The results of a theoretical and experimental study of the interaction of longitudinal coherent bulk acoustic waves at 9.3 GHz with two-dime nsional electron gas (2DEG) at a GaAs/AlxGa1-xAs heterojunction in a s trong magnetic field are given. The theory of the linear 2DEG response to an incident bulk acoustic wave is developed, based on a system of quantum kinetic equations. The importance of disorder in the 2DEG and the coupling of the acoustic waves to the localized states is demonstr ated. A comparison of the theoretical results with experiment is given .