Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-Dimensional Honeycomb Monolayer of Nitrogen Group Elements and the
  Related Nano-Structure: A First-Principle Study   Because of its novel physical properties, two-dimensional materials have
attracted great attention. From first-principle calculations and vibration
frequenceis analysis, we predict a new family of two-dimensional materials
based on the idea of octet stability: honeycomb lattices of pnictogens (N, P,
As, Sb, Bi). The buckled structures of materials come from the sp3
hybridization. These materials have indirect band gap ranging from 0.43eV to
3.7eV. From the analysis of projected density of states, we argue that the s
and p orbitals together are sufficient to describe the electronic structure
under tight-binding model, and the tight-binding parameters are obtained by
fitting the band structures to first-principle results. Surprisingly large
on-site spin-orbit coupling is found for all the pnictogen lattices except
nitrogen. Investigation on the electronic structures of both zigzag and
armchair nanoribbons reveals the possible existence of spin-polarized
ferromagnetic edge states in some cases, which are rare in one-dimensional
systems. These edge states and magnetism may exist under the condition of high
vaccum and low temperature. This new family of materials would have promising
applications in electronics, optics, sensors, and solar cells.

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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: stat
3
The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: q-alg