Spin magnetization of strongly correlated electron gas confined in a two-dimensional finite lattice

Details Spin magnetization of strongly correlated electron gas confined in a two-dimensional finite lattice Spin magnetization of strongly correlated electron gas confined in a two-dimensional finite lattice

2003-04-16

arxiv.org/abs/cond-mat/0304360v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 9 figures

Scientific paper

10.1103/PhysRevB.69.073106

The influence of disorder and interaction on the ground state polarization of the two-dimensional (2D) correlated electron gas is studied by numerical investigations of unrestricted Hartree-Fock equations. The ferromagnetic ground state is found to be plausible when the electron number is lowered and the interaction and disorder parameters are suitably chosen. For a finite system at constant electronic density the disorder induced spin polarization is cut off when the electron orbitals become strongly localized to the individual network sites. The fluctuations of the interaction matrix elements are calculated and brought out as favoring the ferromagnetic instability in the extended and weak localization regime. The localization effect of the Hubbard interaction term is discussed.

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