Abstract
Electron, hole, and exciton states of multishell CdS/HgS/CdS quantum-dot quantum-well nanocrystals are determined by use of a multiband theory that includes valence-band mixing, modeled with a six-band Luttinger-Kohn Hamiltonian, and nonparabolicity of the conduction band. The multiband theory correctly describes the recently observed dim-exciton ground state and the lowest, optically active, bright-exciton states. Charge separation in pair states is identified. Previous single-band theories could not describe these states or account for charge separation.
- Received 5 September 1997
DOI:https://doi.org/10.1103/PhysRevB.57.R4237
©1998 American Physical Society