Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Epitaxial growth and Photoluminescence Excitation spectroscopy of CdSe
  Quantum Dots in (Zn,Cd)Se barrier   Design, epitaxial growth, and resonant spectroscopy of CdSe Quantum Dots
(QDs) embedded in an innovative (Zn,Cd)Se barrier are presented. The (Zn,Cd)Se
barrier enables shifting of QDs energy emission down to 1.87 eV, that is below
the energy of Mn$^{2+}$ ions internal transition (2.1 eV). This opens a
perspective for implementation of epitaxial CdSe QDs doped with several Mn ions
as, e. g., the light sources in high quantum yield magnetooptical devices.
Polarization resolved Photoluminescence Excitation measurements of individual
QDs reveal sharp ($\Gamma <$ 150 $\mu$eV) maxima and transfer of optical
polarization to QD confining charged exciton state with efficiency attaining 26
%. The QD doping with single Mn$^{2+}$ ions is achieved.

2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con