Ladder approximation for the AC conductivity in the generalized two-dimensional Hubbard model
| Autor: | Leonardo S. Lima |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Superconductivity
Physics Hubbard model Born–Huang approximation Zero (complex analysis) 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Optical conductivity Mean field theory Quantum electrodynamics 0103 physical sciences Materials Chemistry Vertex (curve) Condensed Matter::Strongly Correlated Electrons Limit (mathematics) 010306 general physics 0210 nano-technology |
| Zdroj: | Solid State Communications. 258:21-24 |
| ISSN: | 0038-1098 |
| DOI: | 10.1016/j.ssc.2017.04.012 |
| Popis: | We calculate the optical conductivity of the generalized two-dimensional Hubbard model including vertex corrections, by using a ladder approximation in the diagrammatic expansion. We have obtained a superconductor behavior for this system at low temperature. Employing the ladder approach, we have included the influence of the electron-electron interaction on a previous result obtained in the mean field approximation. We have obtained the behavior of the optical conductivity, employing the ladder approximation, tending to zero in the DC limit. Since this approximation is better than the mean field approximation (it include information about the electron-electron interaction) then we have a better description to the behavior of the AC optical conductivity for the two-dimensional Hubbard model. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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