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Journal of Statistical Physics

, Volume 95, Issue 3–4, pp 693–717 | Cite as

Analyticity in Hubbard Models

  • Daniel Ueltschi
Article

Abstract

The Hubbard model describes a lattice system of quantum particles with local (on-site) interactions. Its free energy is analytic when βt is small, or βt2/U is small; here, β is the inverse temperature, U the on-site repulsion, and t the hopping coefficient. For more general models with Hamiltonian H=V+T where V involves local terms only, the free energy is analytic when βT‖ is small, irrespective of V. There exists a unique Gibbs state showing exponential decay of spatial correlations. These properties are rigorously established in this paper.

Hubbard model local interactions analyticity of free energy uniqueness of Gibbs states 

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Copyright information

© Kluwer Academic/Plenum Publishers 1999

Authors and Affiliations

  • Daniel Ueltschi
    • 1
  1. 1.Institut de Physique Théorique, École Polytechnique Fédérale de LausanneLausanneSwitzerland

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