Universal optical conductance of graphite.

  title={Universal optical conductance of graphite.},
  author={Alexey B Kuzmenko and Erik van Heumen and Fabrizio Carbone and Dirk van der Marel},
  journal={Physical review letters},
  volume={100 11},
We find experimentally that the optical sheet conductance of graphite per graphene layer is very close to (pi/2)e2/h, which is the theoretically expected value of dynamical conductance of isolated monolayer graphene. Our calculations within the Slonczewski-Weiss-McClure model explain well why the interplane hopping leaves the conductance of graphene sheets in graphite almost unchanged for photon energies between 0.1 and 0.6 eV, even though it significantly affects the band structure on the same… 

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The curves of 1 ! shown in Fig. 1 of this reference were derived incorrectly from the reflectivity spectra as will be detailed in the forthcoming publication

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