Dynamical model of the dielectric screening of conjugated polymers
Strongly Correlated Electrons
2009-11-10 v1
Abstract
A dynamical model of the dielectric screening of conjugated polymers is introduced and solved using the density matrix renormalization group method. The model consists of a line of quantized dipoles interacting with a polymer chain. The polymer is modelled by the Pariser-Parr-Pople (P-P-P) model. It is found that: (1) Compared to isolated, unscreened single chains, the screened 1Bu- exciton binding energy is typically reduced by ca. 1 eV to just over 1 eV; (2) Covalent (magnon and bi-magnon) states are very weakly screened compared to ionic (exciton) states; (3) Screening of the 1Bu- exciton is closer to the dispersion than solvation limit.
Keywords
Cite
@article{arxiv.cond-mat/0402569,
title = {Dynamical model of the dielectric screening of conjugated polymers},
author = {William Barford and Robert Bursill and David Yaron},
journal= {arXiv preprint arXiv:cond-mat/0402569},
year = {2009}
}
Comments
12 pages, 2 figures