Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiative toroidal dipole and anapole excitations in collectively
  responding arrays of atoms   A toroidal dipole represents an often overlooked electromagnetic excitation
distinct from the standard electric and magnetic multipole expansion. We show
how a simple arrangement of strongly radiatively coupled atoms can be used to
synthesize a toroidal dipole where the toroidal topology is generated by
radiative transitions forming an effective poloidal electric current wound
around a torus. We extend the protocol for methods to prepare a delocalized
collective excitation mode consisting of a synthetic lattice of such toroidal
dipoles and a non-radiating, yet oscillating charge-current configuration,
dynamic anapole, for which the far-field radiation of a toroidal dipole is
identically canceled by an electric dipole.

15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph