Abstract
We have performed femtosecond degenerate four-wave-mixing (DFWM) to investigate coherent transient phenomena in CuCl nanocrystals. We present observation of quantum coherence of weakly confined excitons in nanocrystals through quantum beats in the spectrally resolved signal of DFWM. In large nanocrystals with a mean radius R of 220 Å. the quantum beat between the sublevels of confined excitons is observed. In small nanocrystals with R = 40 A ̊ , we observe the quantum beat between the confined exciton and its optical phonon side band. These results suggest that the coupling of confined excitons to optical phonons becomes stronger for the smaller sizes. In the decay behavior of coherence, the two-component decay is observed, and the fast and slow components are attributed to the homogeneous width of the phonon side band and that of zero-phonon band of the confined exciton transition, respectively.
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