Low-energy scale excitations in the spectral function of organic monolayer systems

Using high-resolution photoemission spectroscopy we demonstrate that the electronic structure of several organic monolayer systems, in particular 1,4,5,8-naphthalene tetracarboxylic dianhydride and copper-phthalocyanine on Ag(111), is characterized by a peculiar excitation feature right at the Fermi...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-04, Vol.85 (16), Article 161404
Main Authors: Ziroff, J., Hame, S., Kochler, M., Bendounan, A., Schöll, A., Reinert, F.
Format: Article
Language:English
Subjects:
Condensed matter
ELECTRONIC PRODUCTS
Electronic structure
Electronics
Excitation
Excitation spectra
Fermi level
Low energy
Monolayers
ORGANIC COMPOUNDS
SPECTRA
Temperature dependence
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Using high-resolution photoemission spectroscopy we demonstrate that the electronic structure of several organic monolayer systems, in particular 1,4,5,8-naphthalene tetracarboxylic dianhydride and copper-phthalocyanine on Ag(111), is characterized by a peculiar excitation feature right at the Fermi level. This feature displays a strong temperature dependence and is immediately connected to the binding energy of the molecular states, determined by the coupling between the molecule and the substrate. At low temperatures, the linewidth of this feature, appearing on top of the partly occupied lowest unoccupied molecular orbital of the free molecule, amounts to only [approximate]25 meV, representing an unusually small energy scale for electronic excitations in these systems. We discuss possible origins, related, e.g., to many-body excitations in the organic-metal adsorbate system, in particular a generalized Kondo scenario based on the single impurity Anderson model.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.85.161404