Abstract
We report the first time-resolved photoluminescence of photorefractive δ-doped superlattices with picosecond resolution. The measurements were performed by the time-correlated photon counting technique. The subband luminescence shows that even at very high photogenerated carrier densities the screening of the internal electric fields remains incomplete. At short times (<500 ps) the dynamics of the structure is determined by recombination in flatband regions. On a longer time scale (1–100 ns) the structure returns to equilibrium via tunneling-assisted recombination. The corresponding lifetimes are consistent with estimates based on the calculated wave functions of the sawtooth structure.
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