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PLE spectrum of the QD under investigation. The energy is displayed with respect to the QD ground state. The strongest peak at is assigned to the -shell absorption and the resonances around correspond to (LO) phonon assisted absorption .
Power dependence of the PL intensity from the QD ground state for cw -shell excitation. The PL signal shows a clear saturation behavior, as expected for a two level system (fitcurve; see text).
(Color online) -shell Rabi oscillations detected in the ground state PL. The Rabi oscillations have a clear developed -pulse maximum, followed by a substantial damping at higher pulse areas. The inset shows the basic excitation/recombination scheme of our experiment (see text).
Photon correlation measurement under the condition of -pulse excitation in the -shell ( integration time). The numbers printed above the peaks give the value of the normalized correlation function. The central peak of the periodic pattern is strongly suppressed, which proves clean single photon emission.
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