Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photo induced ionization dynamics of the nitrogen vacancy defect in
  diamond investigated by single shot charge state detection   The nitrogen-vacancy centre (NV) has drawn much attention for over a decade,
yet detailed knowledge of the photophysics needs to be established. Under
typical conditions, the NV can have two stable charge states, negative (NV-) or
neutral (NV0), with photo induced interconversion of these two states. Here, we
present detailed studies of the ionization dynamics of single NV centres in
bulk diamond at room temperature during illumination in dependence of the
excitation wavelength and power. We apply a recent method which allows us to
directly measure the charge state of a single NV centre, and observe its
temporal evolution. Results of this work are the steady state NV- population,
which was found to be always < 75% for 450 to 610 nm excitation wavelength, the
relative absorption cross-section of NV- for 540 to 610 nm, and the energy of
the NV- ground state of 2.6 eV below the conduction band. These results will
help to further understand the photo-physics of the NV centre.

32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int