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Local electronic edge states of graphene layer deposited on Ir(1 1 1) surface studied by STM/CITS |
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| Authors: | Z Klusek W Kozlowski Z Waqar S Datta IV Makarenko EV Rutkov AN Titkov |
| Institution: | a Department of Solid State Physics, University of Lodz, 90-236 Lodz, Pomorska 149/153, Poland b Advanced Materials Research Institute, University of Northumbria, Ellison Building, Ellison Place, Newcastle upon Tyne NE18ST, UK c A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences 26, Politekhnicheskaya 194021, St. Petersburg, Russia d Lash Miller Chemical Laboratories, Department of Chemistry, University of Toronto, Ont., Canada M5S 3H6 |
| Abstract: | Scanning tunnelling microscopy and current imaging tunnelling spectroscopy were used to observe electronic structure of the edges of monolayer graphite film deposited on the Ir(1 1 1) surface. The electronic structure derived from the tunnelling spectra revealed peak in electron local density of states very close to the Fermi level. This electronic state was interpreted in terms of localised edge state caused by the topology of the π electrons networks typical for the zig-zag edges. The observed maximum of local density of states at about 0.2 eV above the Fermi level was ascribed to the presence of resonant state caused by the appearance of disclinations centres in the vicinity of the graphite edges. |
| Keywords: | 61 16 Ch 61 72 Ff 73 20 At |
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