Exact results in a slave boson saddle point approach for a strongly correlated electron model

Raymond Frésard and Thilo Kopp
Phys. Rev. B 78, 073108 – Published 26 August 2008

Abstract

We revisit the Kotliar-Ruckenstein (KR) slave boson saddle point evaluation for a two-site correlated electron model. As the model can be solved analytically, it is possible to compare the KR saddle point results with the exact many-particle levels. The considered two-site cluster mimics an infinite-U single-impurity Anderson model with a nearest-neighbor Coulomb interaction: one site is strongly correlated with an infinite local Coulomb repulsion, which hybridizes with the second site, on which the local Coulomb repulsion vanishes. Making use of the flexibility of the representation, we introduce appropriate weight factors in the KR saddle point scheme. Ground-state and all excitation levels agree with the exact diagonalization results. Thermodynamics and correlation functions may be recovered in a suitably renormalized saddle point evaluation.

  • Received 6 June 2008

DOI:https://doi.org/10.1103/PhysRevB.78.073108

©2008 American Physical Society

Authors & Affiliations

Raymond Frésard1 and Thilo Kopp2

  • 1Laboratoire CRISMAT, UMR CNRS-ENSICAEN 6508 and IRMA, FR3095 Caen, France
  • 2Center for Electronic Correlations and Magnetism, Institute of Physics, Universität Augsburg, D-86135 Augsburg, Germany

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Issue

Vol. 78, Iss. 7 — 15 August 2008

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