Exciton dispersion in para-quaterphenyl: Significant molecular interactions beyond Coulomb coupling
dc.bibliographicCitation.firstPage | 095313 | eng |
dc.bibliographicCitation.issue | 9 | eng |
dc.bibliographicCitation.journalTitle | AIP Advances | eng |
dc.bibliographicCitation.volume | 11 | eng |
dc.contributor.author | Graf, Lukas | |
dc.contributor.author | Krupskaya, Yulia | |
dc.contributor.author | Büchner, Bernd | |
dc.contributor.author | Knupfer, Martin | |
dc.date.accessioned | 2022-01-25T13:46:53Z | |
dc.date.available | 2022-01-25T13:46:53Z | |
dc.date.issued | 2021 | |
dc.description.abstract | We have experimentally determined the momentum dependence of the electronic excitation spectra of para-quaterphenyl single crystals. The parallel arrangement of para-quaterphenyl molecules results in a strong Coulomb coupling of the molecular excitons. Such crystals have been considered to be a very good realization of the Frenkel exciton model, including the formation of H-type aggregates. Our data reveal an unexpected exciton dispersion of the upper Davydov component, which cannot be rationalized in terms of inter-molecular Coulomb coupling of the excitons. A significant reduction of the nearest neighbor coupling due to additional charge-transfer processes is able to provide an explanation of the data. Furthermore, the spectral onset of the excitation spectrum, which represents a heavy exciton resulting from exciton-phonon coupling, also shows a clear dispersion, which had been unknown so far. Finally, an optically forbidden excitation about 1 eV above the excitation onset is observed. © 2021 Author(s). | eng |
dc.description.fonds | Leibniz_Fonds | |
dc.description.version | publishedVersion | eng |
dc.identifier.uri | https://oa.tib.eu/renate/handle/123456789/7928 | |
dc.identifier.uri | https://doi.org/10.34657/6969 | |
dc.language.iso | eng | eng |
dc.publisher | New York, NY : American Inst. of Physics | eng |
dc.relation.doi | https://doi.org/10.1063/5.0058657 | |
dc.relation.essn | 2158-3226 | |
dc.rights.license | CC BY 4.0 Unported | eng |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | eng |
dc.subject.ddc | 530 | eng |
dc.subject.other | Charge transfer | eng |
dc.subject.other | Dispersions | eng |
dc.subject.other | Excited states | eng |
dc.subject.other | Molecular structure | eng |
dc.subject.other | Single crystals | eng |
dc.subject.other | Charge transfer process | eng |
dc.subject.other | Coulomb couplings | eng |
dc.subject.other | Electronic excitation spectra | eng |
dc.subject.other | Exciton dispersion | eng |
dc.subject.other | Frenkel exciton model | eng |
dc.subject.other | Molecular excitons | eng |
dc.subject.other | Nearest-neighbor coupling | eng |
dc.subject.other | Parallel arrangement | eng |
dc.subject.other | Quaterphenyl | eng |
dc.title | Exciton dispersion in para-quaterphenyl: Significant molecular interactions beyond Coulomb coupling | eng |
dc.type | Article | eng |
dc.type | Text | eng |
tib.accessRights | openAccess | eng |
wgl.contributor | IFWD | eng |
wgl.subject | Physik | eng |
wgl.type | Zeitschriftenartikel | eng |
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