Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A comparative DFT study of electronic properties of 2H-, 4H- and
  6H-SiC(0001) and SiC(000-1) clean surfaces: Significance of the surface Stark
  effect
1
The categories of this paper are: cs
16
The categories of this paper are: stat
19
The categories of this paper are: eess
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol