2003/02/05 by M. E. Torio, A. A. Aligia, H. A. Ceccatto
Materials Science · Physics and Astronomy · #Magnetism in coordination complexes #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.67.165102
6 pages including 7 figures
arxiv created 2003/02/05 · openalex publication_date 2003/04/02 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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_\ensuremathρ, Drude weight Dc, localization parameter zL, and charge gap \ensuremathΔc.