Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Josephson-like currents in graphene for arbitrary time-dependent
  potential barriers   From the exact solution of the Dirac-Weyl equation we find unusual currents
j_y running in y-direction parallel to a time-dependent scalar potential
barrier W(x,t) placed upon a monolayer of graphene, even for vanishing momentum
component p_y. In their sine-like dependence on the phase difference of wave
functions, describing left and right moving Dirac fermions, these currents
resemble Josephson currents in superconductors, including the occurance of
Shapiro steps at certain frequencies of potential oscillations. The
Josephson-like currents are calculated for several specific time-dependent
barriers. A novel type of resonance is discovered when, accounting for the
Fermi velocity, temporal and spatial frequencies match.

5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
2
The categories of this paper are: math