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Decay dynamics of neutral and charged excitonic complexes in single InAs∕GaAs quantum dots

Feucker, M.; Seguin, Robert; Rodt, Sven; Hoffmann, Axel; Bimberg, Dieter

Inst. Festkörperphysik

Systematic time-resolved measurements on neutral and charged excitonic complexes (𝑋, 𝑋𝑋, 𝑋+, and 𝑋𝑋+) of 26 different single InAs∕GaAs quantum dots are reported. The ratios of the decay times are discussed in terms of the number of transition channels determined by the excitonic fine structure and a specific transition time for each channel. The measured ratio for the neutral complexes is 1.7 deviating from the theoretically predicted value of 2. A ratio of 1.5 for the positively charged exciton and biexciton decay time is predicted and exactly matched by the measured ratio indicating identical specific transition times for the transition channels involved.
  • This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 92, 063116 (2008) and may be found at https://doi.org/10.1063/1.2844886.