Strong-coupling expansion for the Hubbard model

TitreStrong-coupling expansion for the Hubbard model
Type de publicationJournal Article
Nouvelles publications1998
AuteursPairault, S, Sénéchal, D, Tremblay, A-MS
JournalPhysical Review Letters
Volume80
Pagination5389–5392
Résumé

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's 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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