Phase diagram and optical conductivity of the ionic Hubbard model
Strongly Correlated Electrons
2007-05-23 v2
Abstract
We investigate the ground state phase diagram of the one-dimensional ionic Hubbard model with an alternating potential at half-filling by the bosonization technique as well as by numerical diagonalization of finite systems with the Lanczos and DMRG methods. Our results support the existence of a single "metallic" transition point from a band to a correlated insulator with simultaneous charge and bond-charge order. In addition, we present results for the optical conductivity obtained by the dynamical DMRG method. The insulator-insulator phase transition scenario is discussed in detail including a critical review of existing approaches and results for the ionic Hubbard model.
Cite
@article{arxiv.cond-mat/0106007,
title = {Phase diagram and optical conductivity of the ionic Hubbard model},
author = {P. Brune and G. I. Japaridze and A. P. Kampf and M. Sekania},
journal= {arXiv preprint arXiv:cond-mat/0106007},
year = {2007}
}
Comments
13 pages, 10 figures