Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tunable terahertz oscillations in superlattices subject to an in-plane
  magnetic field   We present a concept of terahertz oscillations in superlattices that are
generated under conditions apparently different from standard Bloch
oscillations. These oscillations are induced when crossed magnetic and electric
fields are applied to the superlattice, both in the in-plane direction. The
frequency of these oscillations is tunable by the applied fields.

28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an