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Condensed exciton polaritons in a two-dimensional trap : elementary excitations...
Núñez Fernández, Yuriel; Vasilevskiy, Mikhail; Trallero-Giner, Carlos; Kavokin, AlexeyAn exciton-polariton condensate (EPC) confined in a parabolic two-dimensional trap is considered theoretically. In the realistic limit of weakly interacting polaritons, the nonlinear term in the Gross-Pitaevskii equation describing the properties of the condensate can be considered as a perturbationwith respect to the trapping potential, which allows for a convenient analytical description of the EPC ground sta...
Surface phonons modes: a tool to determine the quantum dot morphology
Alcalde,Augusto M.; Ribeiro,Alessandra A.; Dantas,Noélio O.; Mendes Jr.,Djalma R.; Marques,Gilmar E.; Trallero-Giner,CarlosWe report here theoretical and experimental studies on the spatial confinement of phonons in ternary CdSxSe1-x nanocrystals embedded in a glass matrix formed by the composites SiO2-Na2CO3-B2O3-Al2O3 doped with CdO, S and Se. We determined the morphologic characteristics of the nanocrystals by analyzing the dependence of surface phonon modes on the geometrical parameters. The calculated frequencies are compared ...
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