Electron correlations in two-dimensional small quantum dots

Details Electron correlations in two-dimensional small quantum dots Electron correlations in two-dimensional small quantum dots

2004-06-11

arxiv.org/abs/cond-mat/0406258v4

Phys. Rev. B71, 235326 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 9 figures. This replacement contains new content. Results have been recalculated for dots with zero effective thickn

Scientific paper

10.1103/PhysRevB.71.235326

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.

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