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Electron-Hole Correlations and Optical Excitonic Gaps in Quantum-Dot Quantum Wells: Tight-Binding Approach

Published

Author(s)

R H. Xie, Garnett W. Bryant, S Lee, W Jaskolski

Abstract

The electron-hole correlations in quantum-dot quantum wells (QDQW's) is investigated by incorporating Coulomb and exchange interactions into an empirical tight-binding model. Sufficient electron and hole single-particle states close to the band edge are included in the configuration to achieve convergence of the first spin-singlet and triplet excitonic energies within a few meV. Coulomb shifts of about 100 meV and exchange splittings of about I meV for CdS/HgS/CdS QDQW's (4.7 nm CdS core diameter, 0.3 nm Hg well width and 0.3 nm to 1.5 nm CdS clad thickness) which have been characterized experimentally by Weller and co-workers [D.Schooss, A. Mews, A. Eychmuller, H. Weller, Phys. Rev. B, 49, 17072 (1994)]. The optical exciton gaps calculated for those QDQW's are in good agreement with the experiment.
Citation
Physical Review B (Condensed Matter and Materials Physics)
Volume
65
Issue
No. 23

Keywords

coulomb shift quantum dots, electron-hole correlation, exchange splitting, heteronanostructures, optical excitonic gap, quantum wells, tight-binding theory

Citation

Xie, R. , Bryant, G. , Lee, S. and Jaskolski, W. (2002), Electron-Hole Correlations and Optical Excitonic Gaps in Quantum-Dot Quantum Wells: Tight-Binding Approach, Physical Review B (Condensed Matter and Materials Physics) (Accessed February 21, 2024)
Created May 31, 2002, Updated October 12, 2021