Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Possible superconductivity in multi-layer-graphene by application of a
  gate voltage   The carrier density in tens of nanometers thick graphite samples
(multi-layer-graphene, MLG) has been modified by applying a gate voltage
($V_g$) perpendicular to the graphene planes. Surface potential microscopy
shows inhomogeneities in the carrier density ($n$) in the sample near surface
region and under different values of $V_g$ at room temperature. Transport
measurements on different MLG samples reveal that under a large enough applied
electric field these regions undergo a superconducting-like transition at $T
\lesssim 17$ K. A magnetic field applied parallel or normal to the graphene
layers suppresses the transition without changing appreciably the transition
temperature.

15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th