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Resonantly (, black) and nonresonantly (, blue) excited PL. The marked peaks are the exciton , biexciton , and probably trion of the same QD. The PLE spectrum of (red curve) shows phonon resonances at 31, 41, 51, and .
Polarization resolved PL spectra for varying excitation energies. Left and right panel show the linearly counterpolarized exciton states and , respectively. Bottom panel: the fine structure split exciton lines and resonate for excitation at above the respective emission lines.
Intensity scale plot of the PL versus excitation and detection energy. The dotted line is below the laser energy. Notice that also the trion resonates at the same excess energy.
Polarization resolved PL spectra for excitation near the exciton resonance. Both , exciton states can mostly be observed for polarized excitation, indicating a doubly resonant process.
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