The European Physical Journal B

, Volume 68, Issue 3, pp 309–315 | Cite as

Role of the attractive intersite interaction in the extended Hubbard model

  • F. Mancini
  • F. P. Mancini
  • A. NaddeoEmail author


We consider the extended Hubbard model in the atomic limit on a Bethe lattice with coordination number z. By using the equations of motion formalism, the model is exactly solved for both attractive and repulsive intersite potential V. By focusing on the case of negative V, i.e., attractive intersite interaction, we study the phase diagram at finite temperature and find, for various values of the filling and of the on-site coupling U, a phase transition towards a state with phase separation. We determine the critical temperature as a function of the relevant parameters, U/|V|, n and z and we find a reentrant behavior in the plane (U/|V|, T). Finally, several thermodynamic properties are investigated near criticality.


71.10.Fd Lattice fermion models (Hubbard model, etc.) 71.10.-w Theories and models of many-electron systems 


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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  1. 1.Dipartimento di Fisica “E. R. Caianiello”, Unità CNISM di SalernoUniversità degli Studi di SalernoBaronissi (SA)Italy
  2. 2.Dipartimento di Fisica and Sezione I.N.F.N.Università degli Studi di PerugiaPerugiaItaly
  3. 3.Unità CNISM di Salerno, Dipartimento di Fisica “E. R. Caianiello”Università degli Studi di SalernoBaronissi (SA)Italy

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