Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Monte Carlo simulation of a two-dimensional Majorana lattice
  model   We study interacting Majorana fermions in two dimensions as a low-energy
effective model of a vortex lattice in two-dimensional time-reversal-invariant
topological superconductors. For that purpose, we implement ab-initio quantum
Monte Carlo simulation to the Majorana fermion system in which the
path-integral measure is given by a semi-positive Pfaffian. We discuss
spontaneous breaking of time-reversal symmetry at finite temperature.

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The categories of this paper are: hep-ex
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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: astro-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: math