Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Positively charged magneto-excitons in a semiconductor quantum well   A variational calculation of the lower singlet and triplet states of
positively charged excitons (trions) confined to a single quantum well and in
the presence of a perpendicular magnetic field is presented. We study the
dependence of the energy levels and of the binding energy on the well width and
on the magnetic field strength. Our results are compared with the available
experimental data and show a good qualitative and quantitative agreement. A
singlet-triplet crossing is found which for a 200 \AA wide GaAs is predicted to
occur for B = 15 T.

31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs