Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Epitaxial growth of graphene-like silicon nano-ribbons   Graphene, a flat monolayer of carbon atoms tightly packed into a
two-dimensional honeycomb lattice (a one atom thick graphite sheet), is
presently the hottest material in nanoscience and nanotechnology. Its
challenging hypothetical reflection in the silicon world is coined silicene;
Here, we have demonstrated that the silicon nano-wires self-aligned in a
massively parallel array recently observed by STM on Ag(110), are true silicene
nano-ribbons. Our calculations using density functional theory clearly show
that Si atoms tends to form hexagons on top the silver substrate in a
honeycomb, graphene-like arrangement.

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The categories of this paper are: bayes-an
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The categories of this paper are: eess
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin