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Delocalization effect of the Hubbard repulsion in exact terms and two dimensions
- Source :
- Phys. Rev. B77, 245113 (2008)
- Publication Year :
- 2008
-
Abstract
- 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.<br />Comment: 23 pages, 8 figures. Accepted for publication in Phys. Rev. B
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B77, 245113 (2008)
- Publication Type :
- Report
- Accession number :
- edsarx.0804.3872
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.77.245113