Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sub- and super-radiance over macroscopic distances using a perfect lens
  with negative refraction   Two atoms put at the foci of a perfect lens [J.B. Pendry, Phys. Ref. Lett.
85, 3966 (2000)] are shown to exhibit perfect sub- and super-radiance even over
macroscopic distances limited only by the propagation length in the free-space
decay time. If the left-handed material forming the perfect lens has nearly
constant negative refraction and vanishing absorption over a spectral range
larger than the natural linewidth, the imaginary part of the retarded
Greens-function between the two focal points is identical to the one at the
same spatial position and the atoms undergo a Markovian dynamics. Collective
decay rates and level shifts are calculated from the Greens-function of the
Veselago-Pendry lens and limitation as well as potential applications are
discussed.

35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg