PHONON-DRAG EFFECT IN 2D HOLE GASES

The phonon-drag voltage induced by acoustic phonons has been studied f or the first lime in 2D hole gas (2DHG) systems, formed in GaAs/AlGaAs heterostructures. The drag voltage has been measured for different ch arge densities as a function of the phonon source position. Numerical simulations have been performed on the basis of coupled kinetic equati ons for the phonons and holes. Direct comparisons with experimental re sults have provided useful information regarding hole-phonon interacti ons and the inherent properties of the 2DHG systems.