Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Screening by composite charged particles: the case of quantum well
  trions   We study the screening of an external potential produced by a two-dimensional
gas of charged excitons (trions). We determine the contribution to the
dielectric function induced by these composite charged particles within a
random phase approximation. In mixtures of free electrons and trions, the trion
response is found dominant. In the long wave-length limit, trions behave as
point charges with mass equal to the sum of the three particle components. For
finite wave-vectors, we show how the dielectric response is sensitive to the
composite nature of trions and the internal degrees of freedom. Predictions are
presented for the screening of a Coulomb potential, the scattering by charged
impurities and the properties of trionic plasmons.

37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin