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Springer series in chemical physics

Time-Resolved Induced Absorption Due to Exciton-Biexciton Transitions in CuC1

R. Lévy, B. Hönerlage, J. B. Grün

Published Jan 1, 1978• 0 citations
Publisher
DOI
10.1007/978-3-642-67099-2_49

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Time-resolved investigations of induced absorption due to exciton-biexciton transitions in CuCl

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Physical Review Letters•Nov 3, 1997•46 citations
We report time-resolved induced-absorption measurements near the Z3{\mathrm{Z}}_{3}Z3​-exciton resonance in CuCl platelets which were excited at the biexciton resonance by laser pulses of 30-ps duration. We find that the excitons created through biexciton decay induce exponential tails on their absorption line. This effect can be explained in terms of exciton phase-space filling if quantum fluctuations in the local exciton density are taken into account.
Biexciton and triexciton states in CuCl quantum dots were studied by means of time-resolved size-selective pump-and-probe technique. A clear induced absorption band is observed on the high-energy side of the excitation photon energy. The new induced absorption is assigned to the transition from the exciton ground state to one of the weakly correlated exciton pair states which were theoretically predicted to exist and to play an important role in nonlinear optical processes. Its pump energy dependence and temporal evolution strongly support this assignment. Under high-density or two-color excitation condition, a triexciton state in quantum dots is observed for the first time.