Exciton states and their entanglement in coupled quantum dots

Jia-Lin Zhu, Weidong Chu, Zhensheng Dai, and Dong Xu
Phys. Rev. B 72, 165346 – Published 28 October 2005

Abstract

Exciton states and optical spectra in a pair of vertically stacked InGaAsGaAs 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.

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  • Received 15 August 2005

DOI:https://doi.org/10.1103/PhysRevB.72.165346

©2005 American Physical Society

Authors & Affiliations

Jia-Lin Zhu1,*, Weidong Chu1,2, Zhensheng Dai1, and Dong Xu1

  • 1Department of Physics and Key Lab of Atomic and Molecular Nanoscience, Tsinghua University, Beijing 100084, China
  • 2Division of Mathematics and Physics, Chinese People’s Public Security University, Beijing 100038, China

  • *Electronic address: zjl-dmp@tsinghua.edu.cn

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Vol. 72, Iss. 16 — 15 October 2005

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