Picosecond time-resolved far-infrared measurements are presented of the scattering between conduction-band states in a doped quasi quantum dot. These states are created by the application of a magnetic field along the growth direction of an InAs/AlSb quantum well. A clear suppression of the cooling rate is seen, from 1012s-1 when the level spacing is equal to the phonon energy, to 1010s-1 away from this resonance, and thus the results provide unambiguous evidence for the phonon bottleneck. Furthermore, the lifetimes had only weak dependence on temperature between 4 and 80 K. © 1999 The American Physical Society.
|Number of pages
|Physical Review B: Condensed Matter and Materials Physics
|Published - Mar 1999