Abstract
We review the effects caused by a large difference in the dielectric constants of a semiconductor and its surrounding in colloidal semiconductor nanostructures (NSs) with various shapes, e.g., nanocrystals, nanorods, and nanoplatelets. The difference increases the electron–hole interaction and consequently the exciton binding energy and its oscillator transition strength. On the other hand, this difference reduces the electric field of a photon penetrating the NS (the phenomenon is called the local field effect) and reduces the photon coupling to an exciton. We show that the polarization properties of the individual colloidal NSs as well as of their randomly oriented ensemble are determined both by the anisotropy of the local field effect and by the symmetry of the exciton states participating in optical transitions. The calculations explain the temperature and time dependences of the degree of linear polarization measured in an ensemble of CdSe nanocrystals.
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Contribution for the JETP special issue in honor of L.V. Keldysh’s 85th birthday
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Rodina, A.V., Efros, A.L. Effect of dielectric confinement on optical properties of colloidal nanostructures. J. Exp. Theor. Phys. 122, 554–566 (2016). https://doi.org/10.1134/S1063776116030183
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DOI: https://doi.org/10.1134/S1063776116030183