Evidence for semiconducting behavior with a narrow band gap of Bernal graphite

We have studied the resistivity of a large number of highly oriented graphite samples with areas ranging from several mm$^2$ to a few $μ$m$^2$ and thickness from $\sim 10$nm to several tens of micrometers. The measured resistance can be explained by the parallel contribution of semiconducting graphene layers with low carrier density $< 10^9$ cm$^{-2}$ and the one from metallic-like internal interfaces. The results indicate that ideal graphite with Bernal stacking structure is a narrow-gap semiconductor with an energy gap $E_g \sim 40$meV.

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