Optical transitions and nature of Stokes shift in spherical CdS quantum dots

Details Optical transitions and nature of Stokes shift in spherical CdS quantum dots Optical transitions and nature of Stokes shift in spherical CdS quantum dots

2006-03-21

arxiv.org/abs/cond-mat/0603563v1

Phys. Rev. B 73, 155326 (2006)

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.73.155326

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 {\sl ab initio} accuracy charge patching method combined with the %pseudopotential based 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 {\bf k$\cdot$p} calculations, and determine the limits of applicability of the {\bf k$\cdot$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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