M. Hartig et al., FEMTOSECOND LUMINESCENCE MEASUREMENTS OF THE INTERSUBBAND SCATTERING RATE IN ALXGA1-XAS GAAS QUANTUM-WELLS UNDER SELECTIVE EXCITATION/, Physical review. B, Condensed matter, 54(20), 1996, pp. 14269-14272
We have investigated the intersubband scattering of electrons in GaAs
quantum wells using luminescence up-conversion with 100-fs resolution.
The decay time of the n=2 electron-to-heavy-hole transition (e,hh)(2)
depends both on the excess energy of the charge carriers and on the e
xcitation density. A Monte Carlo simulation allows us to reproduce the
experimental data with high accuracy. The intrinsic LO-phonon scatter
ing rate is found to be 2.0x10(12) s(-1) for 80-meV subband separation
. We show the wave-vector dependence and explain the density and exces
s energy dependence.