THE DYNAMIC INTERACTION OF BULK ACOUSTIC-WAVES WITH A 2DEG AT AN ALGAAS GAAS HETEROJUNCTION IN STRONG MAGNETIC-FIELDS - ELASTIC FIELD DISTRIBUTION/

A theoretical study has been made of the interaction of longitudinal c oherent bulk acoustic waves at 9.4 GHz with a 2DEG at a GaAs/AIGaAs he terojunction in a strong magnetic field. A generalized transfer matrix formalism was used to consider such a dynamic interaction in a piezoe lectric medium and hence to analyse the mode composition of the elasti c fields in the layered dissipative structure. It is shown that althou gh the incident wave is longitudinal, the main contribution to the sig nal detected by a CdS bolometer may come from the interference of the transverse acoustic wave forward scattered from the 2DEG and the trans verse wave entering the bolometer after refraction and mode conversion of the primary beam at the Al/GaAs interface.