Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single-photon emission from the natural quantum dots in the InAs/GaAs
  wetting layer   Time-resolved microphotoluminescence study is presented for quantum dots
which are formed in the InAs/GaAs wetting layer. These dots are due to
fluctuations of In composition in the wetting layer. They show spectrally sharp
luminescence lines with a low spatial density. We identify lines related to
neutral exciton and biexciton as well as trions. Exciton emission antibunching
(second order correlation value of g^2(0)=0.16) and biexciton-exciton emission
cascade prove non-classical emission from the dots and confirm their potential
as single photon sources.

26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph