Optical excitations of Peierls-Mott insulators with bond disorder
Strongly Correlated Electrons
2009-11-10 v2
Abstract
The density-matrix renormalization group (DMRG) is employed to calculate optical properties of the half-filled Hubbard model with nearest-neighbor interactions. In order to model the optical excitations of oligoenes, a Peierls dimerization is included whose strength for the single bonds may fluctuate. Systems with up to 100 electrons are investigated, their wave functions are analyzed, and relevant length-scales for the low-lying optical excitations are identified. The presented approach provides a concise picture for the size dependence of the optical absorption in oligoenes.
Keywords
Cite
@article{arxiv.cond-mat/0405180,
title = {Optical excitations of Peierls-Mott insulators with bond disorder},
author = {J. Rissler and E. Jeckelmann and F. Gebhard},
journal= {arXiv preprint arXiv:cond-mat/0405180},
year = {2009}
}
Comments
12 pages, 13 figures, submitted to Phys. Rev. B