In this work we report on two‐color pump‐probe measurements to investigate the intraminiband dynamics of doped GaAs/AlGaAs superlattices with different miniband widths smaller or larger than the optical phonon energy. For a miniband with a width larger than the optical phonon energy we found a fast relaxation, independent of the excitation intensity. For narrow minibands this relaxation takes longer and shows a strong temperature and intensity dependence.

Topics
Phonons, Semiconductors, Superlattices, Pump probe experiments
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© 2009 American Institute of Physics.
2009
American Institute of Physics