Rocking-motion-induced charging of C 60 on h-BN/Ni(111)

M. Muntwiler, W. Auwärter, A. P. Seitsonen, J. Osterwalder, T. Greber

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28 Scopus citations

Abstract

One monolayer of C 60 on one monolayer of hexagonal boron nitride on nickel is investigated by photoemission. Between 150 and 250 K the work function decreases and the binding energy of the highest-occupied molecular orbital increases by ≈ 100 meV. In parallel, the occupancy of the - in the cold state almost empty - lowest unoccupied molecular orbital (LUMO) changes by 0.4±0.1 electrons. This charge redistribution is triggered by the onset of molecular rocking motion, i.e., by orientation dependent tunneling between the LUMO of C 60 and the substrate. The magnitude of the charge transfer is large and cannot be explained within a single-particle picture. It is proposed to involve electron-phonon coupling where C 60 - polaron formation leads to electron self-trapping.

Original languageEnglish
Article number121402
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number12
DOIs
StatePublished - 15 Mar 2005
Externally publishedYes

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