Metal-insulator crossover in the Boson-Fermion model in infinite dimensions
Superconductivity
2009-10-31 v1
Abstract
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.
Keywords
Cite
@article{arxiv.cond-mat/9808252,
title = {Metal-insulator crossover in the Boson-Fermion model in infinite dimensions},
author = {J. -M. Robin and A. Romano and J. Ranninger},
journal= {arXiv preprint arXiv:cond-mat/9808252},
year = {2009}
}
Comments
4 pages, 3 figures, to be published in Phys. Rev. Lett