Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Band Gap Engineering of Two-Dimensional Nitrogene   In our previous study, we have predicted the novel two-dimensional honeycomb
monolayers of pnictogen. In particular, the structure and properties of the
honeycomb monolayer of nitrogen, which we call nitrogene, are very unusual. In
this paper, we make an in-depth investigation of its electronic structure. We
find that the band structure of nitrogene can be engineered in several ways:
controlling the stacking of monolayers, application of biaxial tensile strain,
and application of perpendicular electric field. The band gap of nitrogene is
found to decrease with the increasing number of layers. The perpendicular
electric field can also reduce the band gap when it is larger than 0.18V/
{\AA}, and the gap closes at 0.35V/ {\AA}. A nearly linear dependence of the
gap on the electric field is found during the process. Application of biaxial
strain can decrease the band gap as well, and eventually closes the gap. After
the gap-closing, we find six inequivalent Dirac points in the Brillouin zone
under the strain between 17% and 28%, and the nitrogene monolayer becomes a
Dirac semimetal. These findings suggest that the electronic structure of
nitrogene can be modified by several techniques, which makes it a promising
candidate for electronic devices.

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The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
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: math-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: econ
0
The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
2
The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int