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    Plasmon excitations in graphitic carbon spheres

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    1998_006_PRB.pdf (1.158Mb)
    Date
    1998-06-15
    Author
    Stöckli, Thomas
    Bonard, Jean-Marc
    Châtelain, André
    Wang, Z. L. (Zhong Lin)
    Stadelmann, Pierre
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    Abstract
    Electron energy loss spectroscopy in a high-resolution transmission electron microscope has recently been used with success to characterize the electronic properties of closed cage nanometer-size graphitic particles. In the plasmon region, the experimental data reveal interesting size-dependent variations, which are not yet fully understood. The difficulties encountered in the interpretation of the spectra are principally due to the lack of a complete theoretical treatment of the anisotropic dielectric response in nanometer-size particles. In order to obtain a better understanding of the experimental data we propose a model based on nonrelativistic local dielectric response theory for electrons penetrating through a nested concentric-shell fullerene or the so-called ‘‘carbon onion.’’ The anisotropy of the electronic properties of the sphere is taken into account via the frequency-dependent dielectric tensor of graphite. The model can be applied to simulate electron energy loss spectra as well as line scans through energy filtered images and allows thus a direct comparison to experimental data.
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    http://hdl.handle.net/1853/27882
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