Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Classical and quantum magneto-oscillations of current flow near a p-n
  junction in graphene   The proposed semiclassical theory predicts two types of oscillations in the
flow of current injected from a point source near a ballistic p-n junction in
graphene in a strong magnetic field. One originates from the classical effect
of bunching of cyclotron orbits of electrons passing back and forth across the
p-n interface, which displays a pronounced dependence on the commensurability
between the cyclotron radii in the n- and p-regions. The other effect is caused
by the interference of monochromatic electron waves in p-n junctions with equal
carrier densities on the two sides and it consists in magneto-oscillations in
the current transmission through the interface with periodicity similar to
Shubnikov-de Haas oscillations.

18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol