Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Oriented Graphene Nanoribbons Embedded in Hexagonal Boron Nitride
  Trenches   Graphene nanoribbons (GNRs) are ultra-narrow strips of graphene that have the
potential to be used in high-performance graphene-based semiconductor
electronics. However, controlled growth of GNRs on dielectric substrates
remains a challenge. Here, we report the successful growth of GNRs directly on
hexagonal boron nitride substrates with smooth edges and controllable widths
using chemical vapour deposition. The approach is based on a type of template
growth that allows for the in-plane epitaxy of mono-layered GNRs in
nano-trenches on hexagonal boron nitride with edges following a zigzag
direction. The embedded GNR channels show excellent electronic properties, even
at room temperature. Such in-plane hetero-integration of GNRs, which is
compatible with integrated circuit processing, creates a gapped channel with a
width of a few benzene rings, enabling the development of digital integrated
circuitry based on GNRs.

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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: supr-con