Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fate of Dirac Points in a Vortex Superlattice   We consider noninteracting fermions on the honeycomb lattice in the presence
of a magnetic vortex superlattice. It is shown that depending on the
superlattice periodicity, a gap may open at zero energy. We derive an
expression of the gap in the small-flux limit but the main qualitative features
are found to be valid for arbitrary fluxes. This study provides an original
example of a metal-insulator transition induced by a strongly modulated
magnetic field in graphene. At the same time our results directly apply to
Kitaev's honeycomb model in a vortex superlattice.

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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
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The categories of this paper are: cs
30
The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
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The categories of this paper are: stat