PHONON HEATING OF 2-DIMENSIONAL EXCITON GASES IN GAAS ALGAAS QUANTUM-WELLS/

We report the first measurements of the interaction of non-equilibrium phonons with two-dimensional exciton gases (2 DExGs). The rise in the effective temperature of the 2 DExG produced by the phonons depends o n the width of the quantum well and the exciton sheet density and henc e on the ratio tau-1 (ex-ph)/tau-1 (ex-ex). The dependence of the effe ctive temperature rise on this ratio is attributed to the non-equilibr ium frequency distribution of the phonons incident on the 2 DExG.