Unified phase diagram of models exhibiting neutral-ionic transition
Strongly Correlated Electrons
2009-11-11 v1
Abstract
We have studied the neutral-ionic transition in organic mixed-stack compounds. A unified model has been derived which, in limiting cases, is equivalent to the models proposed earlier, the donor-acceptor model and the ionic Hubbard model. Detailed numerical calculations have been performed on this unified model with the help of the density-matrix renormalization-group (DMRG) procedure calculating excitation gaps, ionicity, lattice site entropy, two-site entropy, and the dimer order parameter on long chains and the unified phase diagram has been determined.
Keywords
Cite
@article{arxiv.cond-mat/0511082,
title = {Unified phase diagram of models exhibiting neutral-ionic transition},
author = {Ö. Legeza and K. Buchta and J. Sólyom},
journal= {arXiv preprint arXiv:cond-mat/0511082},
year = {2009}
}
Comments
11 pages, 8 figures