Abstract
Photoluminescence lifetimes of the level in a large quantum well show a clear nonmonotonic dependence on the density of optically generated carriers. Varying the power density over five orders of magnitude we prove directly the high efficiency of carrier-carrier interaction for intersubband scattering when longitudinal-optical phonon emission is suppressed. For low densities, the observed decay times get shorter (from 40 down to 5 ps) as the density is increased. At high densities Pauli blocking reduces significantly the intersubband scattering rates.
- Received 22 June 1998
DOI:https://doi.org/10.1103/PhysRevB.60.1500
©1999 American Physical Society