Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exhibition of circular Bragg phenomenon by hyperbolic, dielectric,
  structurally chiral materials   The relative permittivity dyadic of a dielectric structurally chiral material
(SCM) varies helicoidally along a fixed direction; in consequence, the SCM
exhibits the circular Bragg phenomenon, which is the
circular-polarization-selective reflection of light. The introduction of
hyperbolicity in an SCM---by making either one or two but not all three
eigenvalues of the relative permittivity dyadic acquire negative real
parts---does not eliminate the circular Bragg phenomenon, but significantly
alters the regime for its exhibition. Physical vapor deposition techniques
appear to be suitable to fabricate hyperbolic SCMs.

36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex