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We have observed dip structures in photoluminescence excitation (PLE) spectra of a highly excited single InGaAs/GaAs self-assembled quantum dot. Some of the exciton PLE peaks lying in continuum states turn into the dips with increasing excitation power. The most remarkable feature is that the biexciton-PLE shows peaks at the excitation energies where the exciton PLE shows the dip structures. Using...
Summary from only given. In recent years, many studies of the electronic states in self-assembled quantum dots (SAQDs) using single dot spectroscopy have been reported. PL spectra measured by single dot spectroscopy show discrete and sharp peaks which indicate 0D confinement of carriers. At higher excitation powers, PL spectra show the interesting phenomena where we see many peaks to be emerged. Delkel...
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