Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Novel Structural Motifs in Oxidized Graphene   The structural and electronic properties of oxidized graphene are
investigated on the basis of the genetic algorithm and density functional
theory calculations. We find two new low energy semiconducting phases of the
fully oxidized graphene (C1O). In one phase, there is parallel epoxy pair
chains running along the zigzag direction. In contrast, the ground state phase
with a slightly lower energy and a much larger band gap contains epoxy groups
in three different ways: normal epoxy, unzipped epoxy, and epoxy pair. For
partially oxidized graphene, a phase separation between bare graphene and fully
oxidized graphene is predicted.

9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin