Optical transitions and nature of Stokes shift in spherical CdSquantum dots

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We study the structure of the energy spectra along with the character of the states participating in optical transitions in colloidal CdS quantum dots (QDs) using the ab initio accuracy charge patching method combined with the folded spectrum calculations of electronic structure of thousand-atom nanostructures. In particular, attention is paid to the nature of the large resonant Stokes shift observed in CdS quantum dots. We find that the top of the valence band state is bright, in contrast with the results of numerous k {center_dot} p calculations, and determine the limits of applicability of the k {center_dot} p approach. The ... continued below

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Demchenko, Denis O. & Wang, Lin-Wang December 16, 2005.

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We study the structure of the energy spectra along with the character of the states participating in optical transitions in colloidal CdS quantum dots (QDs) using the ab initio accuracy charge patching method combined with the folded spectrum calculations of electronic structure of thousand-atom nanostructures. In particular, attention is paid to the nature of the large resonant Stokes shift observed in CdS quantum dots. We find that the top of the valence band state is bright, in contrast with the results of numerous k {center_dot} p calculations, and determine the limits of applicability of the k {center_dot} p approach. The calculated electron-hole exchange splitting suggests the spin-forbidden valence state may explain the nature of the ''dark exciton'' in CdS quantum dots.

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  • Journal Name: Physical Review B; Journal Volume: 73; Journal Issue: 15; Related Information: Journal Publication Date: 04/2006

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  • Report No.: LBNL--59231
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 891218
  • Archival Resource Key: ark:/67531/metadc873079

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  • December 16, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Sept. 30, 2016, 12:28 p.m.

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Demchenko, Denis O. & Wang, Lin-Wang. Optical transitions and nature of Stokes shift in spherical CdSquantum dots, article, December 16, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc873079/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.