Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong magnetoresistance in a graphene Corbino disk at low magnetic
  fields   We have measured magnetoresistance of suspended graphene in the Corbino
geometry at magnetic fields up to $B=0.15\,$T, i.e., in a regime uninfluenced
by Shubnikov-de Haas oscillations. The low-temperature relative
magnetotoresistance $[R(B)-R(0)]/R(0)$ amounts to $4000 B^2\% $ at the Dirac
point ($B$ in Tesla), with a quite weak temperature dependence below $30\,$K. A
decrease in the relative magnetoresistance by a factor of two is found when
charge carrier density is increased to $|n| \simeq 3 \times 10^{-10}$
cm$^{-2}$. The gate dependence of the magnetoresistance allows us to
characterize the role of scattering on long-range (Coulomb impurities, ripples)
and short-range potential, as well as to separate the bulk resistance from the
contact one. Furthermore, we find a shift in the position of the charge
neutrality point with increasing magnetic field, which suggests that magnetic
field changes the screening of Coulomb impurities around the Dirac point. The
current noise of our device amounts to $10^{-23}$ A$^2$/$\sqrt{\textrm{Hz}}$ at
$1\,$kHz at $4\,$K, which corresponds to a magnetic field sensitivity of $60$
nT/$\sqrt{\textrm{Hz}}$ in a background field of $0.15\,$T.

0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg