Bugnet, M., Ederer, M., Lazarov, V. K., Li, L., Ramasse, Q. M., Löffler, S., & Kepaptsoglou, D. M. (2022). Imaging the Spatial Distribution of Electronic States in Graphene Using Electron Energy-Loss Spectroscopy: Prospect of Orbital Mapping. Physical Review Letters, 128(11), Article 116401. https://doi.org/10.1103/PhysRevLett.128.116401
E057-02 - Fachbereich Universitäre Serviceeinrichtung für Transmissions- Elektronenmikroskopie
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Zeitschrift:
Physical Review Letters
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ISSN:
0031-9007
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Datum (veröffentlicht):
18-Mär-2022
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Umfang:
6
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Verlag:
American Physical Society (APS)
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Peer Reviewed:
Ja
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Keywords:
EELS; Orbital Mapping; Spatial Distribution of electronic States in Graphene
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Abstract:
The spatial distributions of antibonding π^{*} and σ^{*} states in epitaxial graphene multilayers are mapped using electron energy-loss spectroscopy in a scanning transmission electron microscope. Inelastic channeling simulations validate the interpretation of the spatially resolved signals in terms of electronic orbitals, and demonstrate the crucial effect of the material thickness on the experimental capability to resolve the distribution of unoccupied states. This work illustrates the current potential of core-level electron energy-loss spectroscopy towards the direct visualization of electronic orbitals in a wide range of materials, of huge interest to better understand chemical bonding among many other properties at interfaces and defects in solids.
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Forschungsinfrastruktur:
Universitäre Service-Einrichtung für Transmissionselektronenmikroskopie
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Projekt (extern):
Austrian Science Fund (FWF) U.S. National Science Foundation