Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dispersion regions overlapping for bulk and surface polaritons in a
  magnetic-semiconductor superlattice   Extraordinary dispersion features of both bulk and surface polaritons in a
finely-stratified magnetic-semiconductor structure which is under an action of
an external static magnetic field in the Voigt geometry are discussed in this
letter. It is shown that the conditions for total overlapping dispersion
regions of simultaneous existence of bulk and surface polaritons can be reached
providing a conscious choice of the constitutive parameters and material
fractions for both magnetic and semiconductor subsystems.

6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn