Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: External-strain-induced semimetallic and metallic phase of
  chlorographene   To overcome the limitations of graphene due to lack of intrinsic band gap, it
is generally functionalized with hydrogen or halogen atoms such as fluorine and
chlorine. Generally, such functionalization yields a moderate- to high-band-gap
material in case of 100% coverage, for example ~1.5 eV in graphene
functionalized with chlorine atoms or chlorographene. In this paper, using ab
initio calculations, we report very interesting transformations observed in
chlorographene under external strain, driving it to a state with nearly
vanishing band gap (under tensile strain) and even converting it to a metal
(under compressive strain). We also show the importance of spin-orbit coupling,
responsible for the few meV band gap of chlorographene observed under high
tensile strain, which would have been a gapless semimetal otherwise.

35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat