Slave boson theory of the extended Falicov-Kimball model
| dc.creator | Brydon, P. M. R. | |
| dc.date | 2007-06-13 | |
| dc.date.accessioned | 2026-07-07T12:33:58Z | |
| dc.date.available | 2026-07-07T12:33:58Z | |
| dc.description | The extended Falicov-Kimball model, with both an on-site hybridization potential and dispersive narrow band, is examined within the saddle-point approximation to the Kotliar-Ruckenstein slave boson theory. We first set the hybridization potential to zero and find that the phase diagram depends strongly upon the orbital structure: for degenerate orbitals, a correlated-insulating state is found at sufficiently strong interaction strengths, whereas a finite orbital energy difference can lead to discontinuous valence transitions. The obtained phase diagram is very sensitive to the presence of a finite hybridization potential. As in Hartree-Fock theory, we find an enhancement of the hybridization by the inter-orbital Coulomb repulsion. The more precise treatment of correlation effects, however, leads to large deviations from the Hartree-Fock results. In the limit of vanishing hybridization an excitonic insulator state is only found when the orbitals are degenerate, which restricts this phase to a much smaller parameter space than in other available mean-field theories. | |
| dc.description | 23 pages, 10 figures | |
| dc.identifier | https://arxiv.org/abs/0706.1883 | |
| dc.identifier | http://arxiv.org/abs/0706.1883 | |
| dc.identifier | Phys. Rev. B 77, 045109 (2008) | |
| dc.identifier | doi:10.1103/PhysRevB.77.045109 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/217262 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Slave boson theory of the extended Falicov-Kimball model | |
| dc.type | text |