We report on spin-flip Raman scattering and on Raman scattering by acoustic phonons in CdS nanocrystals embedded in a glass matrix. We discuss both the spin-flip and the acoustic-phonon Raman spectra on the basis of the interaction of size-quantized electronic excitations with nonconfined acoustic vibrations. The polarization of spin-flip Raman scattering in the Faraday and Voigt configurations is analyzed in comparison with that for bulk CdS. The effective electron g factor has been measured as a function of the quantum dot size.
The reflected and transmitted energy flux corresponding to the linear response of a quantum well (QW) is calculated analytically for the cases of monochromatic and pulsed incident radiation normal to the QW plane. The light–matter interaction has been taken to all orders of perturbation theory, resulting in the appearance of radiative broadening in the expressions for the secondary fields. Three time scales determine the decay of the response after the pulse excitation while the quantum beats are superimposed on the exponentially decaying contributions at the frequency which (i) equals detuning from the electronic transition or (ii) corresponds to a characteristic excitation in the system.
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