Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Impurity States in Graphene   Defects in graphene are of crucial importance for its electronic and magnetic
properties. Here impurity effects on the electronic structure of surrounding
carbon atoms are considered and the distribution of the local densities of
states (LDOS) is calculated. As the full range from near field to the
asymptotic regime is covered, our results are directly accessible by scanning
tunnelling microscopy (STM). We also include exchange scattering at magnetic
impurities and eludicate how strongly spin polarized impurity states arise.

17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph