Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bragg solitons in topological Floquet insulators   We consider a topological Floquet insulator consisting of two honeycomb
arrays of identical waveguides having opposite helicities. The interface
between the arrays supports two distinct topological edge states, which can be
resonantly coupled by additional weak longitudinal refractive index modulation
with a period larger than the helix period. In the presence of Kerr
nonlinearity, such coupled edge states enable topological Bragg solitons.
Theory and examples of such solitons are presented.

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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: math
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The categories of this paper are: astro-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex