Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Carrier Scattering in Quantum Nanosystems   Carrier interaction with phonons, photons, impurities, and electrons have
been addressed in semiconductor nanoscale systems with carrier confinement in
one and two dimensions subjected to a quantizing magnetic field and without it.

2
The categories of this paper are: math
3
The categories of this paper are: physics
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys