LUMO photoemission lineshape in quasi-one-dimensional C$_{60}$ chains

Tamai, A; Baumberger, F; Hengsberger, M; Lobo-Checa, J; Muntwiler, M; Corso, M; Cirelli, C; Patthey, L; Shen, Z X; Greber, T; Osterwalder, J (2010). LUMO photoemission lineshape in quasi-one-dimensional C$_{60}$ chains. Physical Review B, 81(4):045423.

Abstract

The low-energy single-particle excitations of highly ordered C60 chains adsorbed on a vicinal copper substrate are investigated by angle-resolved photoemission spectroscopy. The interface state previously identified on C60/Cu(111) shows a one-dimensional dispersion on Cu(553). In contrast, no significant momentum dependence is detected for emission from the lowest unoccupied molecular orbital (LUMO). The LUMO displays similar phonon features as in C60/Cu(111) but it does not peak toward the Fermi level for all considered potassium dopings and its photoemission lineshape is broader than in any other monolayer system investigated so far. This behavior is not easily reconciled with existing theory and indicates that the one-dimensional character of the chains affects the electronic structure of the monolayer in an intricate way

Abstract

The low-energy single-particle excitations of highly ordered C60 chains adsorbed on a vicinal copper substrate are investigated by angle-resolved photoemission spectroscopy. The interface state previously identified on C60/Cu(111) shows a one-dimensional dispersion on Cu(553). In contrast, no significant momentum dependence is detected for emission from the lowest unoccupied molecular orbital (LUMO). The LUMO displays similar phonon features as in C60/Cu(111) but it does not peak toward the Fermi level for all considered potassium dopings and its photoemission lineshape is broader than in any other monolayer system investigated so far. This behavior is not easily reconciled with existing theory and indicates that the one-dimensional character of the chains affects the electronic structure of the monolayer in an intricate way

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2010 10 Feb 2011 15:51 17 Feb 2018 18:37 American Physical Society 1098-0121 Closed https://doi.org/10.1103/PhysRevB.81.045423