DMRG STUDIES OF THE 1B EXCITON BINDING-ENERGY AND 1B 2A CROSSOVER IN AN EXTENDED HUBBARD-PEIERLS MODEL/

Authors
SHUAI Z PATI SK BREDAS JL RAMASESHA S
Citation
Z. Shuai et al., DMRG STUDIES OF THE 1B EXCITON BINDING-ENERGY AND 1B 2A CROSSOVER IN AN EXTENDED HUBBARD-PEIERLS MODEL/, Synthetic metals, 85(1-3), 1997, pp. 1011-1014
Citations number
22
Categorie Soggetti
Physics, Condensed Matter","Material Science","Polymer Sciences
Journal title
Synthetic metals → ACNP
ISSN journal
03796779
Volume
85
Issue
1-3
Year of publication
1997
Pages
1011 - 1014
Database
ISI
SICI code
0379-6779(1997)85:1-3<1011:DSOT1E>2.0.ZU;2-1
Abstract
Using a symmetrized density matrix renormalization group formulation, we have investigated the electronic binding energy (Eb) Of the lowest optically allowed exciton (1B) and the crossover behavior of the 1B/2A states within an extended Hubbard-Peierls model (with parameters U, V , and delta) for conjugated polylner chains with N=80. The E-b value i s found to be around 0.1 eV for polyacetylene and 0.22-0.45 eV for PPV when considering a realistic range of parameters. The 1B/2A crossover behavior is investigated for a wide range of parameters.