ABSTRACT
Heat-pulse techniques have proved an invaluable tool in the study of the electron-phonon interaction in two dimensional electron gases (2DEGs). The time-of-flight separation of longitudinal (LA) and transverse (TA) acoustic phonon contributions, and angular resolution, can give information not available using the more conventional transport and optical methods. We give a brief review of previous work and describe the application of the technique to two new and very different systems of current interest: GaN epilayers and GaAs quantum wires.
