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Physica A Statistical Mechanics and its Applications

On the phase diagram of the extended Hubbard model with intersite density–density interactions in the atomic limit

Konrad Jerzy Kapcia, S. Robaszkiewicz

Published May 28, 2016• 15 citations
Publisher
DOI
10.1016/j.physa.2016.05.056

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We study the extended Hubbard model with on-site density-density U and intersite pair hopping J interactions, i.e. the Penson-Kolb-Hubbard model.This report focuses mainly on the properties of the model at T ≥ 0 in the case of repulsive J (J < 0) which may stabilize superconductivity with η-pairing.The analysis is performed within the (broken symmetry) Hartree-Fock approximation for arbitrary interaction parameters (J < 0 and U ) and electron concentration (0 < n < 2) on the d = 2 square lattice.The phase diagrams of the model at T = 0 and at finite temperatures are examined taking into account magnetic and charge-ordered phases and superconducting states with η-and s-wave pairing.