Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Soliton fractional charge of disordered graphene nanoribbon   We investigate the properties of the gap-edge states of half-filled
interacting disordered zigzag graphene nanoribbons. We find that the midgap
states can display the quantized fractional charge of 1/2. These gap-edge
states can be represented by topological kinks with their site probability
distribution divided between the opposite zigzag edges with different
chiralities. In addition, there are numerous spin-split gap-edge states,
similar to those in a Mott-Anderson insulator.

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The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: econ
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph
3
The categories of this paper are: physics
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph