Ground state of the frustrated Hubbard model within DMFT: energetics of Mott insulator and metal from ePT and QMC
| dc.creator | Blümer, N. | |
| dc.creator | Kalinowski, E. | |
| dc.date | 2004-07-16 | |
| dc.date.accessioned | 2026-07-07T02:59:14Z | |
| dc.date.available | 2026-07-07T02:59:14Z | |
| dc.description | We present a new method, ePT, for extrapolating few known coefficients of a perturbative expansion. Controlled by comparisons with numerically exact quantum Monte Carlo (QMC) results, 10th order strong-coupling perturbation theory (PT) for the Hubbard model on the Bethe lattice is reliably extrapolated to infinite order. Within dynamical mean-field theory (DMFT), we obtain continuous estimates of energy E and double occupancy D with unprecedented precision O(10^{-5}) for the Mott insulator above its stability edge U_{c1}=4.78 as well as critical exponents. In addition, we derive corresponding precise estimates for E and D in the metallic ground state from extensive low-temperature QMC simulations using a fit to weak-coupling PT while enforcing thermodynamic consistency. | |
| dc.description | 2 pages, 5 figures, submitted to SCES '04 | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0407442 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0407442 | |
| dc.identifier | Physica B 359, 648 (2005) | |
| dc.identifier | doi:10.1016/j.physb.2005.01.179 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/24437 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Ground state of the frustrated Hubbard model within DMFT: energetics of Mott insulator and metal from ePT and QMC | |
| dc.type | text |