Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transparent EuTiO3 films: a novel two-dimensional magneto-optical device
  for light modulation   The magneto-optical activity of high quality transparent thin films of
insulating EuTiO3 (ETO) deposited on a thin SrTiO3 (STO) substrate with both
being non-magnetic materials are demonstrated to be a versatile tool for light
modulation. The operating temperature is close to room temperature and admits
multiple device engineering. By using small magnetic fields birefringence of
the samples can be switched off and on. Similarly, rotation of the sample in
the field can modify its birefringence {\Delta}n. In addition, {\Delta}n can be
increased by a factor of 4 in very modest fields with simultaneously enhancing
the operating temperature by almost 100K.

29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph