Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological Photonic Crystal of Large Valley Chern Numbers   The recent realizations of topological valley phase in photonic crystal, an
analog of gapped valleytronic materials in electronic system, are limited to
the valley Chern number of one. In this letter, we present a new type of valley
phase that can have large valley Chern number of two or three. The valley phase
transitions between the different valley Chern numbers (from one to three) are
realized by changing the configuration of the unit cell. We demonstrate that
these new topological phases can guide the wave propagation robustly along the
domain wall of sharp bent. Our results are promising for the exploration of new
topological phenomena in photonic systems.

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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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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: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: funct-an