Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transition metal ions in ZnO: effects of intrashell Coulomb repulsion on
  electronic properties   Electronic structure of the transition metal (TM) dopants in ZnO is
calculated by first principles approach. Analysis of the results is focused on
the properties determined by the intrashell Coulomb coupling. The role of both
direct and exchange interaction channel is analyzed. The coupling is manifested
in the strong charge state dependence of the TM gap levels, which leads to the
metastability of photoexcited Mn, and determines the accessible equilibrium
charge states of TM ions. The varying magnitude of the exchange coupling is
reflected in the dependence of the spin splitting energy on the chemical
identity across the 3$d$ series, as well as the charge state dependence of
spin-up spin-down exchange splitting.

34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol