Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A novel site-controlled quantum dot system with high uniformity and
  narrow excitonic emission   We report on the optical properties of a newly developed site-controlled
InGaAs Dots in GaAs barriers grown in pre-patterned pyramidal recesses by
metalorganic vapour phase epitaxy. The inhomogeneous broadening of excitonic
emission from an ensemble of quantum dots is found to be extremely narrow, with
a standard deviation of 1.19 meV. A dramatic improvement in the spectral purity
of emission lines from individual dots is also reported (18-30 ueV) when
compared to the state-of-the-art for site controlled quantum dots.

13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th