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Fermion kinetics in the Falicov-Kimball limit of the three-band Emery model

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  • D. K. Sunko

Abstract

The three-band Emery model is reduced to a single-particle quantum model of Falicov-Kimball type, by allowing only up-spins to hop, and forbidding double occupation by projection. It is used to study the effects of geometric obstruction on mobile fermions in thermodynamic equilibrium. For low hopping overlap, there appears a plateau in the entropy, due to charge correlations, and related to real-space disorder. For large overlap, the equilibrium thermopower susceptibility remains anomalous, with a sign opposite to the one predicted from the single-particle density of states. The heat capacity and non-Fermi liquid response are discussed in the context of similar results in the literature. All results are obtained by evaluation of an effective single-particle free-energy operator in closed form. The method to obtain this operator is described in detail. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Suggested Citation

  • D. K. Sunko, 2005. "Fermion kinetics in the Falicov-Kimball limit of the three-band Emery model," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 43(3), pages 319-331, February.
    • Handle: RePEc:spr:eurphb:v:43:y:2005:i:3:p:319-331
    DOI: 10.1140/epjb/e2005-00059-9
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