Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-04-24
Phys. Rev. B77, 245113 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
23 pages, 8 figures. Accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.77.245113
The genuine physical reasons explaining the delocalization effect of the Hubbard repulsion U are analyzed. First it is shown that always when this effect is observed, U acts on the background of a macroscopic degeneracy present in a multiband type of system. After this step I demonstrate that acting in such conditions, by strongly diminishing the double occupancy, U spreads out the contributions in the ground state wave function, hence strongly increases the one-particle localization length, consequently extends the one-particle behavior producing conditions for a delocalization effect. To be valuable, the reported results are presented in exact terms, being based on the first exact ground states deduced at half filling in two dimensions for a prototype two band system, the generic periodic Anderson model at finite value of the interaction.
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