Mapping unoccupied electronic states of freestanding graphene by angle-resolved low-energy electron transmission
| Autor: | Hans-Werner Fink, Conrad Escher, Flavio Wicki, Tatiana Latychevskaia, Jean-Nicolas Longchamp |
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| Přispěvatelé: | University of Zurich |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
3104 Condensed Matter Physics 530 Physics FOS: Physical sciences 02 engineering and technology Electron Electronic structure 10192 Physics Institute 01 natural sciences Resonance (particle physics) law.invention symbols.namesake law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 010306 general physics Electronic band structure Range (particle radiation) Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Graphene Fermi level Materials Science (cond-mat.mtrl-sci) 2504 Electronic Optical and Magnetic Materials 021001 nanoscience & nanotechnology symbols Vacuum level Atomic physics 0210 nano-technology |
| Zdroj: | PHYSICAL REVIEW B |
| DOI: | 10.5167/uzh-129769 |
| Popis: | We report angle-resolved electron transmission measurements through freestanding graphene sheets in the energy range of 18 to 30 eV above the Fermi level. The measurements are carried out in a low-energy electron point source microscope, which allows simultaneously probing the transmission for a large angular range. The characteristics of low-energy electron transmission through graphene depend on its electronic structure above the vacuum level. The experimental technique described here allows mapping of the unoccupied band structure of freestanding two-dimensional materials as a function of the energy and probing angle, respectively, in-plane momentum. Our experimental findings are consistent with theoretical predictions of a resonance in the band structure of graphene above the vacuum level [V. U. Nazarov, E. E. Krasovskii, and V. M. Silkin, Phys. Rev. B 87, 041405 (2013)]. |
| Databáze: | OpenAIRE |
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