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Optical excitations in conjugated polymers

Journal Article · · Physical Review Letters
OSTI ID:878513
We investigate optical absorption spectra and excitons in conjugated polymers from first principles. This is done by calculating the one-particle and two-particle Green's function, including relevant many-body effects and evaluating quasiparticle and optical excitations. Trans-polyacetylene and polyphenylene-vinylene are studied as prototype long chain polymers. The electron-hole interaction gives rise to large exciton binding energies ({approx}1 eV) and dramatically alters the optical spectra. The calculated exciton wave functions are very extended in real space.
Research Organization:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Organization:
USDOE Director. Office of Energy Research. Office of BasicEnergy Sciences. Materials Sciences Division; National Science FoundationGrant DMR-9520554; Deutsche Forschungsgemeinschaft GrangRo-1318/1-1
DOE Contract Number:
AC02-05CH11231
OSTI ID:
878513
Report Number(s):
LBNL--48757; BnR: KC0202030
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 82; ISSN 0031-9007; ISSN PRLTAO
Country of Publication:
United States
Language:
English