Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tunable electronic properties of germanene and two-dimensional group-III
  phosphides heterobilayers   In this research work, the 2D structure of the germanene layer is compounded
with 2D group-III phosphides: AlP and GaP. The planar structure of AlP and
low-buckled GaP have been taken to form the bilayer patterns. In each case,
three stacking patterns are considered, and their relaxed interlayer distance
and binding energy have been reported. The binding energy being around in the
range between ~150 to 210 meV shows the existence of weak van der Waals
interactions between the layers. The heterostructures containing germanene and
these two phosphides show an opening of a large indirect bandgap of magnitude
range of ~200 meV to 600 meV, which can be tuned by changing interlayer
distance and by incorporating bi-axial compressive and tensile strain. Although
their normal bandgap, which significantly changes with SOC, is an indirect one,
whilst tunning the interlayer distance band gap jumps from unsymmetrical point
to symmetrical Dirac cones and becomes direct on K points. The charge carrier
mostly concentrates on the p-orbitals of the germanene in the conduction
regions; thus, the electrical properties of germanene will be retained, and the
carrier will provide a much faster device response property. The absence of the
phosphides influence makes them the intended substrate for growing the
germanene layer on top of that. Again, due to the bandgap at Dirac cones being
opened and jumps between the Dirac cones and band gap changes with SOC
tropological insulator can be formed, and Quantum Spin Hall effect may exist.

10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat