Abstract.
The ionic Hubbard model on a cubic lattice is investigated using analytical approximations, the DMFT and Wilson’s renormalization group for the charge excitation spectrum. Near the Mott insulating regime, where the Hubbard repulsion starts to dominate all energies, the formation of correlated bands is described. The corresponding partial spectral weights and local densities of states show the characteristic features, of a hybridized-band structure as appropriate for the regime at small U, which at half-filling is known as a band insulator. In particular, a narrow charge gap is obtained at half-filling, and the distribution of spectral quasi-particle weight reflects the fundamental hybridization mechanism of the model.
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This term also seems appropriate for the following reason: The Hubbard I-approximation may be reformulated with a perturbation expansion with respect to hopping or hybridization to neighbours. In this frame the Free Theory encorporates all processes not containing local cummulant vertices and realizes as such a very general approximation scheme in which Wicks theorem is formally applicable and propagation through the lattice is free
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Jabben, T., Grewe, N. & Anders, F. Charge gaps and quasiparticle bands of the ionic Hubbard model. Eur. Phys. J. B 44, 47–55 (2005). https://doi.org/10.1140/epjb/e2005-00098-2
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DOI: https://doi.org/10.1140/epjb/e2005-00098-2