Electron correlations in two-dimensional small quantum dots
摘要
We consider circular and elliptic quantum dots with parabolic external confinement, containing 0 - 22 electrons and with values of r_s in the range 0 < r_s < 3. We perform restricted and unrestricted Hartree-Fock calculations, and further take into account electron correlations using second-order perturbation theory. We demonstrate that in many cases correlations qualitatively change the spin structure of the ground state from that obtained under Hartree-Fock and spin-density-functional calculations. In some cases the correlation effects destroy Hund's rule. We also demonstrate that the correlations destroy static spin-density waves observed in Hartree-Fock and spin-density-functional calculations.
引用
@article{arxiv.cond-mat/0406258,
title = {Electron correlations in two-dimensional small quantum dots},
author = {Clare Sloggett and Oleg Sushkov},
journal= {arXiv preprint arXiv:cond-mat/0406258},
year = {2009}
}
备注
11 pages, 9 figures. This replacement contains new content. Results have been recalculated for dots with zero effective thickness (true 2D). For 6 electrons, results have been compared with configuration interaction results from the literature