Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Many-particle resonances in excited states of semiconductor quantum dots   Anderson impurity model for semiconductor quantum dot is extended to take
into account both particle and hole branches of charge excitations. It is shown
that in dots with even number of electrons where the Kondo effect is absent in
the ground state, novel midgap exciton states emerge in the energy spectrum due
to Kondo-type shake-up processes. The relevance of the model to
heterostructures doped by transition metal impurities and to rare earth ions
adsorbed on metallic surfaces is discussed.

22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs