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Brueckner-Hartree-Fock study of circular quantum dots

Emperador, Agustí; Lipparini, Enrico; Serra, Llorenç
Physical Review B 73, 235341 (1-6) (2006)

We calculate ground state energies in the Brueckner-Hartree-Fock theory for $N$ electrons (with $Nle 20$) confined to a circular quantum dot and in presence of a static magnetic field. Comparison with the predictions of Hartree-Fock, local-spin-density and exact configuration-interaction theories is made. We find that the short-range correlations taken into account in Brueckner-Hartree-Fock calculations give an important contribution to the ground state energies, specially in strongly confined dots. In this high-density range, corresponding in practice to self-assembled quantum dots, the results of Brueckner-Hartree-Fock calculations converge to the exact values and are better than those obtained in the local-spin-density approximation.