Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Imaging the local charge environment of nitrogen-vacancy centers in
  diamond   Characterizing the local internal environment surrounding solid-state spin
defects is crucial to harnessing them as nanoscale sensors of external fields.
This is especially germane to the case of defect ensembles which can exhibit a
complex interplay between interactions, internal fields and lattice strain.
Working with the nitrogen-vacancy (NV) center in diamond, we demonstrate that
local electric fields dominate the magnetic resonance behavior of NV ensembles
at low magnetic field. We introduce a simple microscopic model that
quantitatively captures the observed spectra for samples with NV concentrations
spanning over two orders of magnitude. Motivated by this understanding, we
propose and implement a novel method for the nanoscale localization of
individual charges within the diamond lattice; our approach relies upon the
fact that the charge induces an NV dark state which depends on the electric
field orientation.

1
The categories of this paper are: cs
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg