Piryatinski, Andrei and Ivanov, Sergei A. and Tretiak, Sergei and Klimov, Victor I. (2007) Effect of quantum and dielectric confinement on the exciton-exciton interaction energy in type II core/shell semiconductor nanocrystals. NANO LETTERS, 7 (1). pp. 108-115.
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We study theoretically two electron-hole pair states (biexcitons) in core/shell hetero-nanocrystals with type II alignment of energy states, which promotes spatial separation of electrons and holes. To describe Coulomb interactions in these structures, we apply first-order perturbation theory, in which we use an explicit form of the Coulomb-coupling operator that takes into account interface-polarization effects. This formalism is used to analyze the exciton-exciton interaction energy as a function of the core and shell sizes and their dielectric properties. Our analysis shows that the combined contributions from quantum and dielectric confinement can result in strong exciton-exciton repulsion with giant interaction energies on the order of 100 meV. Potential applications of strongly interacting biexciton states include such areas as lasing, nonlinear optics, and quantum information.
|Subjects:||Physical Science > Nanophysics|
|Deposited On:||10 Sep 2009 10:55|
|Last Modified:||10 Sep 2009 10:55|
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