Unrestricted Hartree-Fock for Quantum Dots

Details Unrestricted Hartree-Fock for Quantum Dots Unrestricted Hartree-Fock for Quantum Dots

2003-05-27

arxiv.org/abs/cond-mat/0305623v1

Phys. Rev. B 68, 045309 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 14 figures, submitted 30. Oct. 2002, to appear in PRB. For a version with high-quality figures, see http://www.thp

Scientific paper

10.1103/PhysRevB.68.045309

We present detailed results of Unrestricted Hartree-Fock (UHF) calculations for up to eight electrons in a parabolic quantum dot. The UHF energies are shown to provide rather accurate estimates of the ground-state energy in the entire range of parameters from high densities with shell model characteristics to low densities with Wigner molecule features. To elucidate the significance of breaking the rotational symmetry, we compare Restricted Hartree-Fock (RHF) and UHF. While UHF symmetry breaking admits lower ground-state energies, misconceptions in the interpretation of UHF densities are pointed out. An analysis of the orbital energies shows that for very strong interaction the UHF Hamiltonian is equivalent to a tight-binding Hamiltonian. This explains why the UHF energies become nearly spin independent in this regime while the RHF energies do not. The UHF densities display an even-odd effect which is related to the angular momentum of the Wigner molecule. In a weak transversal magnetic field this even-odd effect disappears.

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