Low-energy electron inelastic mean free path for monolayer graphene
| Autor: | Hideki Yoshikawa, Zejun Ding, Lihao Yang, Hieu T. Nguyen-Truong, Shigeo Tanuma, Bo Da |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Physics and Astronomy (miscellaneous) 02 engineering and technology Electron Dielectric 021001 nanoscience & nanotechnology Inelastic mean free path 01 natural sciences Molecular physics Electron spectroscopy Monolayer graphene Low energy 0103 physical sciences Microscopy Density functional theory 0210 nano-technology |
| Zdroj: | Applied Physics Letters. 117:033103 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/5.0016284 |
| Popis: | The electron inelastic mean free path (IMFP) is an important quantity for electron spectroscopy and microscopy techniques. At present, there are very few data of IMFPs for two-dimensional (2D) materials. Here, we determine the IMFP at energies below 100 eV for monolayer graphene both experimentally and theoretically. The experimental determination is based on a data-driven spectral analysis technique, including the virtual substrate method and the reverse Monte Carlo method. The theoretical determination is performed within the dielectric formalism, using the energy-loss function calculated in the time-dependent density functional theory. The experimental and theoretical results show that the IMFP for monolayer graphene is almost constant (about 1 nm) in the energy range of 6–100 eV. This study suggests a general and reliable approach to determine low-energy IMFPs for 2D materials. |
| Databáze: | OpenAIRE |
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