We performed time-resolved luminescence and polarization-resolved pump-probe experiments in CdSe/ZnS nanocrystals (NCs) under low and high excitations at room temperatures. At high excitations, the PL spectra shows a red shift (0.54 meV) and two-step decay. In pump-probe experiments, we observed very fast spin-flip process (-1 ps) and population oscillation, which is attributed to the Rabi oscillation.
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