Phys. Rev. B 72, 165346 (2005) [7 pages]Exciton states and their entanglement in coupled quantum dotsReceived 15 August 2005; revised 7 September 2005; published 28 October 2005 Exciton states and optical spectra in a pair of vertically stacked InGaAs∕GaAs 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.165346
DOI:
10.1103/PhysRevB.72.165346
PACS:
78.67.Hc, 73.21.La
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