Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High magnetic field induced charge density waves and sign reversal of
  the Hall coefficient in graphite   We report on the investigation of magnetic field induced charge density wave
and Hall coefficient sign reversal in a quasi-two dimensional electronic system
of highly oriented pyrolytic graphite under very strong magnetic field. The
change of Hall sign coefficient from negative to positive occurs at low
temperature and high magnetic field just after the charge density wave
transition, suggesting the role of hole-like quasi-particles in this effect.
Angular dependent measurements show that the charge density wave transition and
Hall sign reversal fields follow the magnetic field component along the c-axis
of graphite.

36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin