Ferromagnetism in the Hubbard model on the square lattice: Improved instability criterion for the Nagaoka state
| dc.creator | Wurth, P. | |
| dc.creator | Uhrig, G. | |
| dc.creator | Mueller-Hartmann, E. | |
| dc.date | 1995-12-08 | |
| dc.date.accessioned | 2026-07-07T03:08:05Z | |
| dc.date.available | 2026-07-07T03:08:05Z | |
| dc.description | The instability of the fully polarized ferromagnetic state (Nagaoka state) with respect to single spin flips is re-examined for the Hubbard model on the square lattice with a large family of variational wave functions which include correlation effects of the majority spins in the vicinity of the flipped spin. We find a critical hole density of $δ_{cr} = 0.251$ for $U = \infty$ and a critical coupling of $U_{cr} = 77.7 t$. Both values improve previous variational results considerably. | |
| dc.description | 10 pages + 1 figure, submitted as uuencoded compressed ps-file, to be published in Annalen der Physik | |
| dc.identifier | https://arxiv.org/abs/cond-mat/9512060 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/9512060 | |
| dc.identifier | Annalen der Physik 5, 148 (1996) | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/27416 | |
| dc.subject | Condensed Matter | |
| dc.title | Ferromagnetism in the Hubbard model on the square lattice: Improved instability criterion for the Nagaoka state | |
| dc.type | text |