Gaussian Effective Potential and antifferomagnetism in the Hubbard model

Luca Marotta, Luca Marotta, Fabio Siringo

Risultato della ricerca: Article

13 Citazioni (Scopus)

Abstract

The Gaussian Effective Potential (GEP) is shown to be a useful variational tool for the study of the magnetic properties of strongly correlated electronic systems. The GEP is derived for a single band Hubbard model on a two-dimensional bi-partite square lattice in the strong coupling regime. At half-filling the antiferromagnetic order parameter emerges as the minimum of the effective potential with an accuracy which improves over RPA calculations and is very close to that achieved by Monte Carlo simulations. Extensions to other magnetic systems are discussed.
Lingua originaleEnglish
pagine (da-a)1250130-1-1250130-12
Numero di pagine12
RivistaModern Physics Letters B
Volume26
Stato di pubblicazionePublished - 2012

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics

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