Spin fluctuations and pseudogap in the two-dimensional half-filled Hubbard model at weak coupling
| dc.creator | Dupuis, N. | |
| dc.date | 2001-10-08 | |
| dc.date | 2002-07-04 | |
| dc.date.accessioned | 2026-07-07T06:21:45Z | |
| dc.date.available | 2026-07-07T06:21:45Z | |
| dc.description | Starting from the Hubbard model in the weak-coupling limit, we derive a spin-fermion model where the collective spin excitations are described by a non-linear sigma model. This result is used to compute the fermion spectral function $A({\bf k},ω)$ in the low-temperature regime where the antiferromagnetic (AF) coherence length is exponentially large (``renormalized classical'' regime). At the Fermi level, $A({\bf k}_F,ω)$ exhibits two peaks around $\pmΔ_0$ (with $Δ_0$ the mean-field gap), which are precursors of the zero-temperature AF bands, separated by a pseudogap. | |
| dc.description | 6 pages, 2 figures, revised version | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0110138 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0110138 | |
| dc.identifier | Phys. Rev. B 65, 245118 (2002) | |
| dc.identifier | doi:10.1103/PhysRevB.65.245118 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/95704 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Spin fluctuations and pseudogap in the two-dimensional half-filled Hubbard model at weak coupling | |
| dc.type | text |