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Is Graphene in Vacuum an Insulator? by Drut, Joaquín E.; Lähde, Timo A. is a scholarly article available to read on EtoBox.

What is Is Graphene in Vacuum an Insulator? about?

We present evidence, from Lattice Monte Carlo simulations of the phase diagram of graphene as a function of the Coulomb coupling between quasiparticles, that graphene in vacuum is likely to be an insulator. We find a semimetal-insulator transition at $\alpha_g^\text{crit} = 1.11 \pm 0.06$, where $\alpha_g^{} \simeq 2.16$ in vacuum, and $\alpha_g^{} \simeq 0.79$ on a SiO$_2^{}$ substrate. Our analysis uses the logarithmic derivative of the order parameter, supplemented by an equation of state. The insulating phase disappears above a critical number of four-component fermion flavors $4 < N_f^{\text{crit}} < 6$. Our data are consistent with a second-order transition.

Author

Drut, Joaquín E.; Lähde, Timo A.

Published

2008

Language

EN