Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Is graphene in vacuum an insulator?   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.

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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg