Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability of negative and positive trions in quantum wires   Binding energies of negative ($X^-$) and positive trions ($X^+$) in quantum
wires are studied for strong quantum confinement of carriers which results in a
numerical exactly solvable model. The relative electron and hole localization
has a strong effect on the stability of trions. For equal hole and electron
confinement, $X^+$ is more stable but a small imbalance of the particle
localization towards a stronger hole localization e.g. due to its larger
effective mass, leads to the interchange of $X^-$ and $X^+$ recombination lines
in the photoluminescent spectrum as was recently observed experimentally. In
case of larger $X^-$ stability, a magnetic field oriented parallel to the wire
axis leads to a stronger increase of the $X^+$ binding energy resulting in a
crossing of the $X^+$ and $X^-$ lines.

2
The categories of this paper are: math
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th