Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Current-induced spin polarization in graphene due to Rashba spin-orbit
  interaction   Spin polarization induced by an external electric field in graphene is
considered theoretically in the linear response regime. The graphene is assumed
to be deposited on a substrate which leads to the spin-orbit interaction of
Rashba type. The induced spin polarization is shown to be in the graphene plane
and perpendicular to the electric field. However, the spin polarization changes
sign when the Fermi level, whose position can be controlled by an external gate
voltage, crosses the Dirac points.

13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th