Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theoretical prediction of sandwiched two-dimensional phosphide binary
  compounds sheets with tunable bandgaps and anisotropic physical properties   New allotropes of two-dimensional (2D) GaP and InP binary compounds were
predicted from the structural optimization and dynamical stability analysis in
the framework of the density functional calculations. These stabilized GaP and
InP monolayers possess unique high buckled orthorhombic lattices symmetry with
their cohesive energies of ~0.14 and ~0.17 eV/pair lower than those of 2D low
buckled honeycomb GaP and InP binary compounds, demonstrating that these newly
predicted 2D GaP and InP binary compounds are energetically preferential. More
interesting, their energy band gaps are even ~ 0.52 eV (for GaP) and ~1.49 eV
(for InP) wider than their bulk counterparts. Such band gaps are also tunable
under the strain along armchair/zigzag direction, and the direct/indirect band
gap transitions occur under certain strain, providing their promising
applications in band gap engineering for nanoscale electronic and
optoelectronic devices. A feasible way to synthesize these novel 2D phosphide
compounds is also provided in this study.

33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th