Phase diagram of thet−t′−Uchain at half filling
| Autor: | M. E. Torio, H. A. Ceccatto, A. A. Aligia |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | Physical Review B. 67 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.67.165102 |
| Popis: | We study the half-filled Hubbard chain including next-nearest-neighbor hopping ${t}^{\ensuremath{'}}.$ The model has three phases: one insulating phase with dominant spin-density-wave correlations at large distances (SDWI), another phase with dominant spin-dimer correlations or dimerized insulator (DI), and a third one in which long-distance correlations indicate singlet superconductivity (SS). The boundaries of the SDWI are accurately determined numerically through a crossing of excited energy levels equivalent to the jump in the spin Berry phase. The DI-SS boundary is studied using several indicators such as correlation exponent ${K}_{\ensuremath{\rho}},$ Drude weight ${D}_{c},$ localization parameter ${z}_{L},$ and charge gap ${\ensuremath{\Delta}}_{c}.$ |
| Databáze: | OpenAIRE |
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