Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-06-08
Phys. Rev. B 64, 125101 (2001)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 6 included figures, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.64.125101
The boson-fermion model, describing a mixture of itinerant electrons hybridizing with tightly bound electron pairs represented as hard-core bosons, is here generalized with the inclusion of a term describing on-site Coulomb repulsion between fermions with opposite spins. Within the general framework of the Dynamical Mean-Field Theory, it is shown that around the symmetric limit of the model this interaction strongly competes with the local boson-fermion exchange mechanism, smoothly driving the system from a pseudogap phase with poor conducting properties to a metallic regime characterized by a substantial reduction of the fermionic density. On the other hand, if one starts from correlated fermions described in terms of the one-band Hubbard model, the introduction in the half-filled insulating phase of a coupling with hard-core bosons leads to the disappearance of the correlation gap, with a consequent smooth crossover to a metallic state.
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