Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charging of graphene by magnetic field and mechanical effect of magnetic
  oscillations   We discuss the fact that quantum capacitance of graphene-based devices leads
to variation of it's charge density under changes of external magnetic
field.The charge is conserved, but redistributes to substrate or other graphene
sheet. We derive exact analytic expression for charge redistribution in the
case of ideal graphene in strong magnetic field. When we account for impurities
and temperature, the effect decreases and the formulae reduce to standard
quantum capacitance expressions. The importance of quantum capacitance for
potential Casimir force experiments is emphasized and an application of atomic
force microscope technique for measurement of density of states is proposed.

31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin