Abstract
Intersubband scattering and cooling of hot carriers is investigated in an -type modulation-doped As/ As multiple-quantum-well structure. The nonlinear absorption is monitored in several picosecond pump-and-probe experiments after selective excitation of the electrons to the subband. In addition, the relaxation of hot electron-hole pairs created by interband absorption is studied. An upper limit of 3 ps for the lifetime of the electronic subband is estimated. The cooling is dominated by LO-phonon scattering; the energy loss rate is reduced by a factor of up to 130 compared to the value obtained from theoretical calculations.
- Received 13 April 1988
DOI:https://doi.org/10.1103/PhysRevB.38.4307
©1988 American Physical Society