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• W2012198001 abstract "The band-edge exciton fine structure of wurtzite CdSe nanocrystals is investigated by a plane-wave pseudopotential method that includes spin−orbit coupling, screened electron−hole Coulomb interactions, and exchange interactions. Large-scale, systematic simulations have been carried out on quantum dots, nanorods, nanowires, and nanodisks. The size and shape dependence of the exciton fine structure is explored over the whole diameter−length configuration space and is explained by the interplay of quantum confinement, intrinsic crystal-field splitting, and electron−hole exchange interactions. Our results show that the band-edge exciton fine structure of CdSe nanocrystals is determined by the origin of their valence-band single-particle wave functions. Nanocrystals where the valence-band maximum originates from the bulk A band have a “dark” ground-state exciton. Nanocrystals where the valence-band maximum is derived from the bulk B band have a “quasi-bright” ground-state exciton. Thus, the diameter−length configuration map can be divided into two regions, corresponding to dark and quasi-bright ground-state excitons. We find that the dark/quasi-bright ground-state exciton crossover is not only diameter-dependent but also length-dependent, and it is characterized by a curve in the two-parameter space of diameter and length." @default.
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• W2012198001 date "2007-09-27" @default.
• W2012198001 modified "2023-10-12" @default.
• W2012198001 title "Shape Dependence of Band-Edge Exciton Fine Structure in CdSe Nanocrystals" @default.
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• W2012198001 doi "https://doi.org/10.1021/nl0713070" @default.
• W2012198001 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17900160" @default.
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