On X-ray-singularities in the f-electron spectral function of the Falicov-Kimball model
| dc.creator | Anders, Frithjof B. | |
| dc.creator | Czycholl, G. | |
| dc.date | 2004-11-29 | |
| dc.date.accessioned | 2026-07-07T07:36:12Z | |
| dc.date.available | 2026-07-07T07:36:12Z | |
| dc.description | The f-electron spectral function of the Falicov-Kimball model is calculated within the dynamical mean-field theory using the numerical renormalization group method as the impurity solver. Both the Bethe lattice and the hypercubic lattice are considered at half filling. For small U we obtain a single-peaked f-electron spectral function, which --for zero temperature-- exhibits an algebraic (X-ray) singularity ($|ω|^{-α}$) for $ω\to 0$. The characteristic exponent $α$ depends on the Coulomb (Hubbard) correlation U. This X-ray singularity cannot be observed when using alternative (Keldysh-based) many-body approaches. With increasing U, $α$ decreases and vanishes for sufficiently large U when the f-electron spectral function develops a gap and a two-peak structure (metal-insulator transition). | |
| dc.description | 8 pages, 8 figures, revtex | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0411721 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0411721 | |
| dc.identifier | Phys. Rev. B 71, 125101 (2005) | |
| dc.identifier | doi:10.1103/PhysRevB.71.125101 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/120345 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | On X-ray-singularities in the f-electron spectral function of the Falicov-Kimball model | |
| dc.type | text |