Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electronic Properties of Graphene Nanoribbon on Si(001) Substrate   We show by first-principles calculations that the electronic properties of
zigzag graphene nanoribbons (Z-GNRs) adsorbed on Si(001) substrate strongly
depend on ribbon width and adsorption orientation. Only narrow Z-GNRs with even
rows of zigzag chains across their width adsorbed perpendicularly to the Si
dimer rows possess an energy gap, while wider Z-GNRs are metallic due to
width-dependent interface hybridization. The Z-GNRs can be metastably adsorbed
parallel to the Si dimer rows, but show uniform metallic nature independent of
ribbon width due to adsorption induced dangling-bond states on the Si surface.

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The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an