Entanglement in GaAs and CdSe quantum dots: Exact calculations and DFT approximations

  • Authors:

  • J. P. Coe;A. Sudbery;I. D'Amico

  • Affiliations:

  • Department of Physics, University of York, York YO10 5DD, UK and Department of Mathematics, University of York, York YO10 5DD, UK;Department of Mathematics, University of York, York YO10 5DD, UK;Department of Physics, University of York, York YO10 5DD, UK

  • Venue:
  • Microelectronics Journal
  • Year:
  • 2009

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Abstract

We consider two electrons confined in spherical GaAs and CdSe quantum dots and calculate their ground-state spatial entanglement exactly within a parabolic confinement model. We propose a perturbative scheme to approximate the above entanglement within density-functional theory and show that it reproduces the exact results quite accurately for GaAs dots of diameter up to 25nm and CdSe dots of diameter up to 15nm.