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Abstract: Phys. Rev. Lett. 101, 146801 (2008)

Electron lifetimes in a Shockley-type metal-organic interface state

C. H. Schwalb, S. Sachs, M. Marks, A. Schöll, F. Reinert, E. Umbach, and U. Höfer
Fachbereich Physik und Zentrum für Materialwissenschaften, Philipps-Universität, D-35032 Marburg, Germany



The lifetimes of electrons at the PTCDA/Ag(111) interface have been studied by means of time- and angle-resolved two-photon photoemission. We observe a dispersing unoccupied state 0.6 eV above the Fermi level with an effective electron mass of 0.39 me at the ‾Γ-point. The short lifetime of 54~fs is indicative for a large penetration of the wavefunction into the metal. Supported by model calculations this interface state is interpreted as predominantly arising from an upshift of the occupied Shockley surface state of the clean metal due to the interaction with the PTCDA overlayer.


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DOI: 10.1103/PhysRevLett.101.146801

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