2000/08/31 by Adolfo Avella, A. Avella, F. Mancini +3
Chemistry · Mathematics · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Algebraic structures and combinatorial models #Theoretical and Computational Physics #cond-mat.str-el
paper · pdf · doi:10.1140/epjb/e2002-00323-6
published as Eur. Phys. J. B 29, 399 (2002) · 19 RevTeX pages, 41 embedded eps figures
openalex publication_date 2002/10/01 · arxiv created 2002/10/09 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Although effective for two dimensional (2D) systems, some approximations may fail in describing the properties of one-dimensional (1D) models, which belong to a different universality class. In this paper, we analyze the adequacy of the Composite Operator Method (COM), which provides a good description of many features of 2D strongly correlated systems, in grasping the physics of 1D models. To this purpose, the 1D Hubbard model is studied within the framework of the COM by considering a two-pole approximation and a paramagnetic ground state. The local, thermodynamic and single-particle properties, the correlation functions and susceptibilities are calculated in the case of half filling and arbitrary filling. The results are compared with those obtained by the Bethe Ansatz (BA) as well as by other numerical and analytical techniques. The advantages and limitations of the method are analyzed in detail.