Abstract
Exciton states and optical spectra in a pair of vertically stacked quantum dots are studied with a proposed variation-diagonalization technique. The spectra obtained are in good agreement with experiments. The tunnel coupling and the exciton entanglement are also investigated. It is found that at short barrier widths, the entanglement is small due to the coupling between the intradot and interdot orbitals. At large barrier widths, large entanglement appears in coupled identical quantum dots; however, such an entanglement can be easily destroyed by the broken symmetry because of the weak tunneling of the hole.
1 More- Received 15 August 2005
DOI:https://doi.org/10.1103/PhysRevB.72.165346
©2005 American Physical Society