Journal Article

PreJuSER-19653

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Final-state diffraction effects in angle-resolved photoemission at an organic-metal interface

Posseik, F.FZJ* ; Giovanelli, L. ; Amsalem, P. ; Petaccia, L. ; Topwal, D. ; Gorovikov, S. ; Abel, M. ; Koch, N. ; Porte, L. ; Goldoni, A. ; Themlin, J.-M.

2011
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/10885  doi:10.1103/PhysRevB.84.241407

Abstract: In this paper it is shown that angle-resolved photoemission performed using low-energy photons on an organicmetal interface allows to clearly distinguish genuine interface states from features of substrate photoelectrons diffracted by the molecular lattice. As a model system an ordered monolayer of Zn-phthalocyanine is used as a diffraction lattice to probe the electronic band structure of a Ag(110) substrate. Photoemission close to normal emission geometry reveals strongly dispersive features absent in the pristine substrate spectra. Density functional theory modeling helped identifying these as bulk sp direct transitions undergoing surface-umklapp processes. The present results establish the important role of final-state diffraction effects in photoemission experiments at organic-inorganic interfaces.

Keyword(s): J

Note: The authors acknowledge V. N. Strocov for fruitful discussions. D. Lonza is acknowledged for technical assistance during the experiments. P.A. and N.K. gratefully acknowledge financial support by the DFG.

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Contributing Institute(s):

1. Funktionale Nanostrukturen an Oberflächen (PGI-3)
2. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2011

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