2000/09/30 by Holger Frahm, Martin Stahlsmeier
Physics and Astronomy · #Advanced Chemical Physics Studies #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #cond-mat
paper · pdf · doi:10.1103/physrevb.63.125109
published as Phys. Rev. B 63, 125109 (2001) · RevTeX+epsf macros, 23 pp. including figures
arxiv created 2000/12/22 · openalex publication_date 2001/03/12 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We construct a family of electronic-ladder models with SO(5) symmetry that have exact ground states in the form of finitely correlated wave functions. Extensions for these models preserving this symmetry are studied using these states in a variational approach. Within this approach, the zero-temperature phase diagram of these electronic ladders at half filling is obtained, reproducing the known results in the weak coupling (band insulator) and strong-coupling regime, first studied by Scalapino, Zhang, and Hanke. Finally, the compact form of the variational wave functions allows us to compute various correlation functions for these systems.