Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quasi-one-dimensional ballistic ring in crossed high-frequency electric
  fields   We study electron dynamics in a quasi-one-dimensional ballistic ring driven
by two crossed high-frequency electric fields parallel to the ring plane. The
averaged dipole moment and emission intensity are calculated. The emission
polarization coincides with the direction of one of the fields. A possibility
is shown of the polarization switching to perpendicular direction under changes
in the field amplitudes and frequencies.

33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom