The Small Polaron Crossover: Role of Dimensionality
| dc.creator | Capone, M. | |
| dc.creator | Ciuchi, S. | |
| dc.creator | Grimaldi, C. | |
| dc.date | 1998-12-11 | |
| dc.date.accessioned | 2026-07-07T03:12:22Z | |
| dc.date.available | 2026-07-07T03:12:22Z | |
| dc.description | The crossover from quasi free electron to small polaron in the Holstein model for a single electron is studied by means of both exact and self-consistent calculations in one dimension and on an infinite coordination lattice, in order to understand the role of dimensionality in such a crossover. We show that a small polaron ground-state occurs when both strong coupling ($λ>1$) and multiphonon ($α^2 >1$) conditions are fulfilled leading to different relevant coupling constants ($λ$) in adiabatic and ($α^2$) anti adiabatic region of the parameters space. We also show that the self-consistent calculations obtained by including the first electron-phonon vertex correction give accurate results in a sizeable region of the phase diagram well separated from the polaronic crossover. | |
| dc.description | 4 pages, 3 figures. To appear in J. of Superconductivity (Proceedings Stripes98) | |
| dc.identifier | https://arxiv.org/abs/cond-mat/9812195 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/9812195 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/28880 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | The Small Polaron Crossover: Role of Dimensionality | |
| dc.type | text |