Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theory of the Kitaev model in a [111] magnetic field   Recent numerical studies indicate that the antiferromagnetic Kitaev honeycomb
lattice model undergoes a magnetic-field-induced quantum phase transition into
a new spin-liquid phase. This intermediate-field phase has been previously
characterized as a gapless spin liquid. By implementing a recently developed
variational approach based on the exact fractionalized excitations of the
zero-field model, we demonstrate that the field-induced spin liquid is gapped
and belongs to Kitaev's 16-fold way. Specifically, the low-field non-Abelian
liquid with Chern number $C=\pm 1$ transitions into an Abelian liquid with
$C=\pm 4$. The critical field and the field-dependent behaviors of key physical
quantities are in good quantitative agreement with published numerical results.
Furthermore, we derive an effective field theory for the field-induced critical
point which readily explains the ostensibly gapless nature of the
intermediate-field spin liquid.

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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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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: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph