Abstract:
For a class of generalized one dimensional Hubbard models, we study the stability region for the superconducting η-pairing ground state. We exploit the Optimum Ground State (OGS) approach and the Lanczos diagonalization procedure to derive a sequence of improved bounds. We show that some pieces of the stability boundary are asymptotic, namely independent on the OGS cluster size. The phenomenon is explained by studying the properties of certain exact eigenstates of the OGS Hamiltonians.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received 27 July 1999 and Received in final form 29 September 1999
Rights and permissions
About this article
Cite this article
Beccaria, M. Hierarchies of stability regions for η-pairing superconducting ground states of generalized Hubbard models. Eur. Phys. J. B 14, 523–526 (2000). https://doi.org/10.1007/s100510051061
Issue Date:
DOI: https://doi.org/10.1007/s100510051061