Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cooperative spontaneous decay of local excitation in a dense and
  disordered ensemble of point-like impurity atoms near a charged conductive
  surface   On the basis of the general quantum microscopic theory we study the process
of spontaneous decay of an excited atom in a dense and disordered ensemble of
point-like impurity atoms embedded into transparent dielectric and located near
a charged perfectly conducting surface. We have analyzed the simultaneous
influence of the modified spatial structure of field modes near the conductive
surface and the electric field on the character of interatomic dipoledipole
interaction. This leads to the modification of the transition spectrum of an
excited atom inside an ensemble and the spontaneous decay dynamics. We have
shown that the electric field changes the cooperative Lamb shift, as well as
the character of sub- and superradiant decay.

2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg