Anisotropy and interplane interactions in the dielectric response of graphite.

Phys Rev Lett

Laboratoire des Solides Irradiés, UMR 7642 CNRS/CEA, Ecole Polytechnique, F-91128 Palaiseau, France.

Published: August 2002

We determined the anisotropic dielectric response of graphite by means of time-dependent density-functional theory and high-resolution valence electron energy-loss spectroscopy. The calculated loss function was in very good agreement with the experiment for a wide range of momentum-transfer orientations with respect to the graphitic basal planes, provided that local-field effects were included in the response. The calculations also showed strong effects of the interlayer Coulomb interaction on the total pi+sigma plasmon. This finding must be taken into account for the explanation of recent loss spectra of carbon nanotube materials.

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http://dx.doi.org/10.1103/PhysRevLett.89.076402DOI Listing

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