Delocalization effect of the Hubbard repulsion in exact terms and two dimensions
| dc.creator | Gulacsi, Zsolt | |
| dc.date | 2008-04-24 | |
| dc.date.accessioned | 2026-07-07T09:44:26Z | |
| dc.date.available | 2026-07-07T09:44:26Z | |
| dc.description | 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. | |
| dc.description | 23 pages, 8 figures. Accepted for publication in Phys. Rev. B | |
| dc.identifier | https://arxiv.org/abs/0804.3872 | |
| dc.identifier | http://arxiv.org/abs/0804.3872 | |
| dc.identifier | Phys. Rev. B77, 245113 (2008) | |
| dc.identifier | doi:10.1103/PhysRevB.77.245113 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/162874 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Disordered Systems and Neural Networks | |
| dc.title | Delocalization effect of the Hubbard repulsion in exact terms and two dimensions | |
| dc.type | text |