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Is graphene in vacuum an insulator? · Around

2008

Is graphene in vacuum an insulator?

Drut, Joaquín E., Lähde, Timo A.

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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 $4 < N_f^{\text{crit}} < 6$.

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