Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: GW electronic structure calculations of Co doped ZnO   Recently the point defect responsible for the intra-3$d$ luminescence of
cobalt in doped ZnO samples has been indentified\,\cite{pssb2019}. In this work
we further extend our investigation to other point defects in Co-doped ZnO. We
use density-functional theory and GW calculations to determined the
orbital-resolved band structure of cobalt doped zinc oxide (ZnO).
  We show that mainly O-p and Co-d orbitals take part in the process and
confirm that an oxygen interstitial nearby a cobalt atom is a likely defect to
occur in Co-implanted ZnO samples. We also rule out that other common point
defects in ZnO can be responsible for the observed intra-3$d$ transition.
Finally, we suggest that defect complexes involving oxygen interstitials could
be used to promote ferromagnetism in cobalt doped ZnO samples.

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The categories of this paper are: alg-geom
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The categories of this paper are: stat
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
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The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: econ
20
The categories of this paper are: acc-phys