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Electron, hole, and exciton states of multishell CdS/HgS/CdS quantum-dotquantum well nanocrystals are determined by use of a multiband theory thatincludes valence-band mixing, modeled with a 6-band Luttinger-Kohn Hamiltonian,and nonparabolicity of the conduction band. The multiband theory correctlydescribes the recently observed dark-exciton ground state and the lowest,optically active, bright-exciton states. Charge separation in pair states isidentified. Previous single-band theories could not describe these states oraccount for charge separation.Comment: 10 pages of ReVTex, 6 ps figures, submitted to Phys. Rev.

Multiband theory of quantum-dot quantum wells: Dim excitons, bright excitons, and charge separation in heteronanostructures