Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Application of a quantum wave impedance method for study of infinite and
  semi-infinite periodic media   This paper is dedicated to an application of a quantum wave impedance
approach for a study of infinite and semi-infinite periodic systems. Both a
Dirac comb and a $\delta-\delta'$ comb as well as a Kronig-Penney model are
considered. It was shown how to reformulate the problem of an investigation of
mentioned systems in terms of a quantum wave impedance and it was demonstrated
how much a quantum wave impedance approach simplifies studying these systems
compared to other methods. The illustation of such a simplification was
provided by application of classical approach, transfer matrix technique and a
quatum wave impedance method for solving Kronig-Penney model.

3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin