Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation of valley polarized current in bilayer graphene   We propose a device for the generation of valley polarized electronic current
in bilayer graphene. By analyzing the response of this material to intense
terahertz frequency light in the presence of a transverse electric field, we
demonstrate that dynamical states are induced in the gapped energy region, and
if the system parameters are properly tuned, these states exist only in one
valley. The valley polarized states can then be used to filter an arbitrary
electron current, so generating a valley polarized current.

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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: cs