Universal infrared conductivity of graphite
L.A. Falkovsky
TL;DR
This paper analytically evaluates the infrared conductivity of graphite in the 0.1-1.5 eV range, revealing it to be close to the universal conductivity of graphene and explaining features via electron dispersion singularities.
Contribution
It provides an analytical evaluation of graphite's infrared conductivity, connecting it to graphene's universal conductivity and electron dispersion features.
Findings
Conductivity per layer is close to graphene's universal value.
Features explained by singularities in electron dispersion.
Neglects electron relaxation processes in the specified energy range.
Abstract
The conductivity of graphite is analytically evaluated in the range of 0.1-1.5 eV, where the electron relaxation processes can be neglected, and the low energy excitations at the "Dirac" points are most essential. The value of conductivity calculated per one graphite layer is close to the universal conductivity of graphene. The features of the conductivity are explained in terms of singularities of the electron dispersion in graphite.
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