Strong-Coupling Expansion for the Hubbard Model

1997/10/31 by Stéphane Pairault, David Sénéchal, A. -M. S. Tremblay · 1 citation
Physics and Astronomy · #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.80.5389

published as Phys. Rev. Lett. 80, 5389 (1998) · 4 pages, RevTex, 3 epsf figures included

arxiv created 1998/06/16 · arxiv updated 2009/11/30

Abstract

A strong-coupling expansion for models of correlated electrons in any dimension is presented. The method is applied to the Hubbard model in d dimensions and compared with numerical results in d=1. Third order expansion of the Green function suffices to exhibit both the Mott metal-insulator transition and a low-temperature regime where antiferromagnetic correlations are strong. It is predicted that some of the weak photoemission signals observed in one-dimensional systems such as SrCuO₂ should become stronger as temperature increases away from the spin-charge separated state.

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