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Large dispersion of incoherent spectral features in highly ordered C60 chains


Tamai, A; Seitsonen, A P; Greber, T; Osterwalder, J (2006). Large dispersion of incoherent spectral features in highly ordered C60 chains. Physical Review. B, Condensed Matter and Materials Physics, 74(8):085407.

Abstract

Ordered one-dimensional C-60 chains on a vicinal Cu template were studied by angle-resolved photoemission. A complete structural model for C-60 on Cu(553) is proposed, where two differently coordinated and oriented C-60 molecules self-assemble in chains along the steps of the vicinal substrate. The highest occupied molecular orbital-derived peak shows a broad Gaussian line shape with features dispersing up to 400 meV along the chains. The line shape is interpreted in terms of a strong electron-phonon interaction leading to the formation of polarons with a spectral function dominated by incoherent multiphonon excitations. The large dispersion of this incoherent peak derives from a particularly favorable relative orientation of the molecules and is in good agreement with the one-electron band structure calculated by density functional theory, which indicates that the photoelectrons carry some memory of the frozen lattice.

Abstract

Ordered one-dimensional C-60 chains on a vicinal Cu template were studied by angle-resolved photoemission. A complete structural model for C-60 on Cu(553) is proposed, where two differently coordinated and oriented C-60 molecules self-assemble in chains along the steps of the vicinal substrate. The highest occupied molecular orbital-derived peak shows a broad Gaussian line shape with features dispersing up to 400 meV along the chains. The line shape is interpreted in terms of a strong electron-phonon interaction leading to the formation of polarons with a spectral function dominated by incoherent multiphonon excitations. The large dispersion of this incoherent peak derives from a particularly favorable relative orientation of the molecules and is in good agreement with the one-electron band structure calculated by density functional theory, which indicates that the photoelectrons carry some memory of the frozen lattice.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:530 Physics
540 Chemistry
Language:English
Date:2006
Deposited On:26 Mar 2009 17:55
Last Modified:05 Apr 2016 12:27
Publisher:American Physical Society
ISSN:1098-0121
Publisher DOI:https://doi.org/10.1103/PhysRevB.74.085407

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