Electronic properties of the three-band Hubbard model
| dc.creator | Zoelfl, M. B. | |
| dc.creator | Maier, Th. | |
| dc.creator | Pruschke, Th. | |
| dc.creator | Keller, J. | |
| dc.date | 1998-09-17 | |
| dc.date.accessioned | 2026-07-07T03:11:32Z | |
| dc.date.available | 2026-07-07T03:11:32Z | |
| dc.description | We study the electronic band-structure and transport properties of a CuO2-plane within the three-band Hubbard model. The Dynamical Mean-Field Theory (DMFT) is used to solve the many particle problem. The calculations show that the optical gap Delta_opt is given by excitations from the lower Hubbard band into the so called Zhang-Rice singlet band. The optical gap Delta_opt turns out to be considerably smaller than the charge transfer energy Delta (Delta=ep-ed) for a typical set of parameters, which is in agreement with experiment. For the two-dimensional CuO2-plane we investigated the dependency of the shape of the Fermi surface on the different hopping parameters t_CuO and t_OO. A value t_OO/t_CuO >0$ leads to a Fermi surface surrounding the M point. An additional different static shift of the oxygen energies is also considered to calculate the electronic response due to a displacement of the oxygen atoms given by a frozen phonon. The density-density correlation for the oxygen orbitals is linear in doping for both hole and electron doping but shows a different temperature dependency in the two regimes. In the first case it is temperature independent and increases upon doping, which leads to an increasing electron-phonon coupling for the B_1g-mode in high-Tc superconductors. | |
| dc.description | 8 pages, submitted to EPJ B | |
| dc.identifier | https://arxiv.org/abs/cond-mat/9809236 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/9809236 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/28609 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Electronic properties of the three-band Hubbard model | |
| dc.type | text |