Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Carbon sp chains in graphene nanoholes   Nowadays sp carbon chains terminated by graphene or graphitic-like carbon are
synthesized routinely in several nanotech labs.
  We propose an ab-initio study of such carbon-only materials, by computing
their structure and stability, as well as their electronic, vibrational and
magnetic properties.
  We adopt a fair compromise of microscopic realism with a certain level of
idealization in the model configurations, and predict a number of properties
susceptible to comparison with experiment.

6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex