Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Growth and structural characterization of pyramidal site-controlled
  quantum dots with high uniformity and spectral purity   This work presents some fundamental features of pyramidal site-controlled
InGaAs Quantum Dots (QDs) grown by MetalOrganic Vapour Phase Epitaxy on
patterned GaAs (111)B substrate. The dots self-form inside pyramidal recesses
patterned on the wafer via pre-growth processing. The major advantage of this
growth technique is the control it provides over the dot nucleation posi-tion
and the dimensions of the confined structures onto the sub-strate. The
fundamental steps of substrate patterning and the QD forma-tion mechanism are
described together with a discussion of the structural particulars. The
post-growth processes, including sur-face etching and substrate removal, which
are required to facili-tate optical characterization, are discussed. With this
approach extremely high uniformity and record spectral purity are both
achieved.

1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph