Phase Separation close to the density-driven Mott transition in the Hubbard-Holstein model
Strongly Correlated Electrons
2007-08-07 v2
Abstract
The density driven Mott transition is studied by means of Dynamical Mean-Field Theory in the Hubbard-Holstein model, where the Hubbard term leading to the Mott transition is supplemented by an electron-phonon (e-ph) term. We show that an intermediate e-ph coupling leads to a first-order transition at T=0, which is accompanied by phase separation between a metal and an insulator. The compressibility in the metallic phase is substantially enhanced. At quite larger values of the coupling a polaronic phase emerges coexisting with a non-polaronic metal.
Keywords
Cite
@article{arxiv.cond-mat/0305699,
title = {Phase Separation close to the density-driven Mott transition in the Hubbard-Holstein model},
author = {M. Capone and G. Sangiovanni and C. Castellani and C. Di Castro and M. Grilli},
journal= {arXiv preprint arXiv:cond-mat/0305699},
year = {2007}
}
Comments
4 pages, 3 figures. Slightly revised text. More details in Fig.1 and 2. Smaller size version of Fig.3