Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Assignment of multiband luminescence due to the gallium vacancy-oxygen
  defect complex in GaN   Oxygen is the most common unintentional impurity found in GaN. We study the
interaction between substitutional oxygen (ON) and the gallium vacancy (VGa) to
form a point defect complex in GaN. The formation energy of the gallium vacancy
is largely reduced in n-type GaN by complexing with oxygen, while thermodynamic
and optical transition levels remain within the band gap. We study the
spectroscopy of this complex using a hybrid quantum-mechanical
molecular-mechanical (QM/MM) embedded-crystal approach. We reveal how a single
defect center can be responsible for multiband luminescence, including the
ubiquitous yellow luminescence signature observed in n-type GaN, owing to the
coexistence of diffuse (extended) and compact (localized) holes.

22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs