Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic electron energy loss and induced radiation emission in
  two-dimensional metallic photonic crystals I: formalism and surface plasmon
  polariton   A fully relativistic description of the electron energy loss and the induced
radiation emission in arbitrary arrays of non-overlapping metallic cylinders is
presented in terms of the multiple scattering method on the basis of vector
cylindrical waves. Numerical analysis is given for dilute and dense arrays of
Aluminum cylinders with a nanoscale diameter. The results of the electron
energy loss spectrum are well correlated with the dispersion relation of
coupled surface plasmon polaritons, and can be interpreted with an effective
medium approximation when the electron runs inside the arrays. In addition, the
cavity modes localized in the grooves between the cylinders can affect strongly
the electron energy loss spectrum.

32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an