Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 108-115 |
| Number of pages | 8 |
| Journal | Nano Letters |
| Volume | 7 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 2007 |
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ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Chemistry (miscellaneous)
Cite this
Effect of quantum and dielectric confinement on the exciton-exciton interaction energy in type II core/shell semiconductor nanocrystals. / Piryatinski, Andrei; Ivanov, Sergei A.; Tretiak, Sergei; Klimov, Victor I.
In: Nano Letters, Vol. 7, No. 1, 01.2007, p. 108-115.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Effect of quantum and dielectric confinement on the exciton-exciton interaction energy in type II core/shell semiconductor nanocrystals
AU - Piryatinski, Andrei
AU - Ivanov, Sergei A.
AU - Tretiak, Sergei
AU - Klimov, Victor I
PY - 2007/1
Y1 - 2007/1
N2 - 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.
AB - 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.
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U2 - 10.1021/nl0622404
DO - 10.1021/nl0622404
M3 - Article
VL - 7
SP - 108
EP - 115
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 1
ER -