Abstract
Carrier capture times due to the emission of confined longitudinal optical phonons via electron–phonon (Fröhlich) interaction are calculated for GaAs-AlxGa1−xAs and In0.47Ga0.53As-InP superlattices. A dielectric continuum model is used to describe the confined phonon modes and we use a Kronig–Penney type calculation for the electron envelope functions. We compare our results with capture times measured by several optical techniques and we discuss the importance of a knowledge of the carrier excitation details in order to obtain an appropriate interpretation of the experimental results. We show that electrons excited into confined states with a large kinetic energy strongly influence the overall capture times.
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