Anisotropy and interplane interactions in the dielectric response of graphite.
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.
Laboratoire des Solides Irradiés, UMR 7642 CNRS/CEA, Ecole Polytechnique, F-91128 Palaiseau, France.
A G
AG
Marinopoulos
Lucia
L
Reining
Valerio
V
Olevano
Angel
A
Rubio
T
T
Pichler
X
X
Liu
M
M
Knupfer
J
J
Fink