Abstract
The spectrally resolved FWM signal of CdSe quantum dots with sizes below the bulk excitonic Bohr radius has been studied as a function of temperature and excitation intensity and compared with bulk CdSe. A clear oscillation with a period of 163 fs (≈︂ 25 meV) is found in the transient FWM signal and attributed to a coherent coupling of confined electron–hole pairs with LO-phonons. Two side bands are observed in the spectrum 25 meV below and above the excitonic resonance. The strong coupling to LO-phonons is observed even at excitation densities around 1×1016 cm—3 which is close to the bulk value of the Mott density.
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