Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarization induced by charged particles in real solids   We report a first-principles description of the induced wake potential and
density in real solids. The linear-response formalism is used to obtain the
potential and density induced by an external charge penetrating through an
inhomogeneous periodic system. The linear dynamical response of the system is
evaluated in the random-phase approximation, by including the full band
structure of the solid. The impact of the periodic crystalline potential is
analyzed, and variations of the wake along different channels in Al and Si are
investigated.

34
The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat