Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on ``Two-dimensional charged-biexciton complexes''   We re-examine the results of A. Thilagam [Phys. Rev. B 55, 7804 (1997)], who
calculated the ratio of the binding energies of the two dimensional exciton
complexes. We point out that, for charged biexciton complexes, this calculation
is oversimplified, and these systems do not always form bound states if they
interact via pure Coulomb interaction. If experiment proved the existence of
these objects, their bindings would have to be explained by other mechanisms.

12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph