Strong-Coupling Expansion for the Hubbard Model

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 $SrCu{O}_2$ should become stronger as temperature increases away from the spin-charge separated state.

4 pages, RevTex, 3 epsf figures included

References in corpus (1)

• The spectral weight of the Hubbard model through cluster perturbation theory

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