Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Imaging graphene field-effect transistors on diamond using
  nitrogen-vacancy microscopy   The application of imaging techniques based on ensembles of nitrogen-vacancy
(NV) sensors in diamond to characterise electrical devices has been proposed,
but the compatibility of NV sensing with operational gated devices remains
largely unexplored. Here we fabricate graphene field-effect transistors (GFETs)
directly on the diamond surface and characterise them via NV microscopy. The
current density within the gated graphene is reconstructed from NV magnetometry
under both mostly p- and n-type doping, but the exact doping level is found to
be affected by the measurements. Additionally, we observe a surprisingly large
modulation of the electric field at the diamond surface under an applied gate
potential, seen in NV photoluminescence and NV electrometry measurements,
suggesting a complex electrostatic response of the oxide-graphene-diamond
structure. Possible solutions to mitigate these effects are discussed.

17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th