Metal-insulator crossover in the Boson-Fermion model in infinite dimensions

Details Metal-insulator crossover in the Boson-Fermion model in infinite dimensions Metal-insulator crossover in the Boson-Fermion model in infinite dimensions

1998-08-24

arxiv.org/abs/cond-mat/9808252v1

Phys. Rev. Lett. 81, 2755 (1998)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.81.2755

The Boson-Fermion model, describing a mixture of tightly bound electron pairs and quasi-free electrons hybridized with each other via a charge exchange term, is studied in the limit of infinite dimensions, using the Non-Crossing Approximation within the Dynamical Mean Field Theory. It is shown that a metal-insulator crossover, driven by strong pair fluctuations, takes place as the temperature is lowered. It manifests itself in the opening of a pseudogap in the electron density of states, accompanied by a corresponding effect in the optical and dc conductivity.

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