Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physical properties of highly uniform InGaAs pyramidal quantum dots with
  GaAs barriers: Fine structure splitting in pre-patterned substrates   InGaAs Quantum Dots embedded in GaAs barriers, grown in inverted tetrahedral
recesses of 7 {\mu}m edge, have showed interesting characteristics in terms of
uniformity and spectral narrowness of the emission. In this paper we present a
study on the fine structure splitting (FSS). The investigation of about 40
single quantum dots revealed two main points: (1) the values of this parameter
are very similar from dot to dot, proving again the uniformity of Pyramidal QD
properties, (2) there is a little chance, in the sample investigated, to find a
dot with natural zero splitting, but the values found (the mean being 13
{\mu}eV) should always guarantee the capability of restoring the degeneracy
with some corrective technique (e.g. application of a small magnetic field).

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The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas