Magnetism in the Hubbard model-An improved treatment
| dc.creator | Uldry, A. | |
| dc.creator | Elliott, R. J. | |
| dc.date | 2003-04-03 | |
| dc.date.accessioned | 2026-07-07T02:50:35Z | |
| dc.date.available | 2026-07-07T02:50:35Z | |
| dc.description | We propose a new treatment of the Hubbard model that is based both on the coherent-potential approximation (CPA) and the virtual-crystal approximation (VCA). It is well known that the equilibrium found using the one-particle CPA Green's functions does not predict an ordered magnetic ground state, while Stoner's mean-field treatment, which is equivalent to the VCA on the Hubbard model, does so for a wide range of parameters. A hybrid treatment, the tau-CPA, is developed, in which a particle is assumed to be scattered from an array of static opposite spins for a time tau related to the inverse of the band width. The propagation is treated in the CPA over this period; thereafter the particle sees the time-averaged effect of the scatterers and hence can be treated in the VCA. This model, with suitable approximations, does predict magnetism for a modified Stoner criterion. | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0304081 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0304081 | |
| dc.identifier | J. Phys.: Condens. Matter 16 (2004) S5221-S5231 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/21155 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Magnetism in the Hubbard model-An improved treatment | |
| dc.type | text |