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

摘要

A theoretical study has been made of the interaction of longitudinal coherent bulk acoustic waves at 9.4 GHz with a 2DEG at a GaAs/AIGaAs heterojunction in a strong magnetic field. A generalized transfer matrix formalism was used to consider such a dynamic interaction in a piezoelectric medium and hence to analyse the mode composition of the elastic fields in the layered dissipative structure. It is shown that although the incident wave is longitudinal, the main contribution to the signal detected by a CdS bolometer may come from the interference of the transverse acoustic wave forward scattered from the 2DEG and the transverse wave entering the bolometer after refraction and mode conversion of the primary beam at the Al/GaAs interface. References: 15