Stability of the shell structure in 2D quantum dots

Abstract

We study the effects of external impurities on the shell structure in semiconductor quantum dots by using a fast response-function method for solving the Kohn-Sham equations. We perform statistics of the addition energies up to 20 interacting electrons. The results show that the shell structure is generally preserved even if effects of high disorder are clear. The Coulomb interaction and the variation in ground-state spins have a strong effect on the addition-energy distributions, which in the noninteracting single-electron picture correspond to level statistics showing mixtures of Poisson and Wigner forms.

7 pages, 8 figures, submitted to Phys. Rev. B

References in corpus (8)

• Correlation energy and spin polarization in the 2D electron gas
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• Absence of bimodal peak spacing distribution in the Coulomb blockade regime
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Cited by in corpus (4)

• Three real-space discretization techniques in electronic structure calculations
• Geometric and impurity effects on quantum rings in magnetic fields
• Effects of screened Coulomb impurities on autoionizing two-electron resonances in spherical quantum dots
• Electron localization function for two-dimensional systems