Electronic structure of a subnanometer wide bottom-up fabricated graphene nanoribbon: End states, band gap, and dispersion
| Autor: | Felix Leyssner, Petra Tegeder, Manuel Utecht, Tillmann Klamroth, Christopher Bronner, Peter Saalfrank, Stephan Stremlau |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Condensed matter physics Band gap Graphene Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Nanotechnology Electronic structure Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention law Dispersion (optics) Ribbon Institut für Chemie |
| Popis: | Angle-resolved two-photon photoemission and high-resolution electron energy loss spectroscopy are employed to derive the electronic structure of a sub-nanometer tomically precise quasi-one-dimensional graphene nanoribbon (GNR) on Au(111). We resolved occupied and unoccupied electronic bands including their dispersion and determined the and gap, which possesses an unexpected large value of 5.1 eV. Supported by density functional theory (DFT) calculations for the idealized infinite polymer and finite size oligomers an unoccupied non-dispersive electronic state with an energetic position in the middle of the band gap of the GNR could be identified. This state resides at both ends of the ribbon (end state) and is only found in the finite sized systems, i.e. the oligomers. 5 pages, 4 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|