Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low-symmetry two-dimensional BNP$_2$ and C$_2$SiS structures with high
  and anisotropic carrier mobilities   We study the stability and electronic structure of previously unexplored
two-dimensional (2D) ternary compounds BNP$_2$ and C$_2$SiS. Using $ab$
$initio$ density functional theory, we have identified four stable allotropes
of each ternary compound and confirmed their stability by calculated phonon
spectra and molecular dynamics simulations. Whereas all BNP$_2$ allotropes are
semiconducting, we find C$_2$SiS, depending on the allotrope, to be
semiconducting or semimetallic. The fundamental band gaps of the semiconducting
allotropes we study range from $1.4$ eV to $2.2$ eV at the HSE06 level $0.5$ eV
to $1.4$ eV at the PBE level and display carrier mobilities as high as
$1.5{\times}10^5$ cm$^2$V$^{-1}$s$^{-1}$. Such high mobilities are quite
uncommon in semiconductors with so wide band gaps. Structural ridges in the
geometry of all allotropes cause a high anisotropy in their mechanical and
transport properties, promising a wide range of applications in electronics and
optoelectronics.

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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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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: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin