CARRIER COOLING AND RECOMBINATION HEATING IN INTERMIXED GAAS ALGAAS QUANTUM WIRES AND DOTS/

The cooling of photoexcited hot carriers in 2D, 1D and 0D systems is s tudied experimentally. In comparison with a theoretical carrier relaxa tion model which holds for 2D and 1D systems, it is found that prefera bly recombination and a weaker electron-LO-phonon interaction dominate s the carrier dynamics with decreasing dimensionality. Consequently, w e conclude a less dominant role of hot-phonon effects in 0D and 1D sys tems compared to 2D systems.