Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonequilibrium valley polarization in graphene nanoconstrictions   We recently shown, using tight-binding calculations, that nonequilibrium
valley polarization can be realized in graphene, when the current is injected
through "valley filter": a ballistic point contact with zigzag edges. Here we
demonstrate, that the effect is surprisingly robust against changing the
crystallographic orientation of the filter axis. Namely, the output current
remains polarized unless a point contact has perfect armchair edges, at which
two subblattices are equally represented. The polarization is inverted when the
filter orientation crosses the amchair line and, subsequently, dominating
subblattice index of terminal atoms changes. In a bended graphene strip, the
valley-polarized current can be directed towards one edge providing a
theoretical possibility to observe a zero-magnetic-field analogue of the
well-known Hall effect. For the valley valve, build of two valley filters in
series and controlled elecrostatically by a gate voltage, the
conductance-to-gate characteristic is inverted when $\pi/3$ vertex is placed
between two filters.

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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
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The categories of this paper are: stat
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
33
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: cs
23
The categories of this paper are: solv-int