Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photo-induced valley currents in strained graphene   The theoretical results are presented showing that strain-induced anisotropy
of graphene spectrum gives rise to the valley currents under the illumination
by normally incident light. The currents of the two graphene valleys are
mutually compensated providing zero net electric current. The magnitude and
direction of the valley currents are determined by the parameters of strain and
light polarization. For not too high photon energy strain-induced valley
current exceed that due to intrinsic warping of the graphene spectrum which
suggests feasibility of strain-mediated valleytronics.

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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas