Anisotropy and interplane interactions in the dielectric response of graphite

Physical Review Letters 89, 76402 - 4 (2002)

Anisotropy and interplane interactions in the dielectric response of graphite

A.G. Marinopoulos, L. Reining, V. Olevano, A. Rubio, T. Pichler, X. Liu, M. Knupfer, J. Fink

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 π+σ 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.89.076402

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