Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: In situ resonant x-ray study of vertical correlation and capping e ects
  during GaN/AlN quantum dots growth   Grazing incidence anomalous x-ray scattering was used to monitor in situ the
molecular beam epitaxy growth of GaN/AlN quantum dots (QDs). The strain state
was studied by means of grazing incidence Multi-wavelength Anomalous Di raction
(MAD) in both the QDs and the AlN during the progressive coverage of QDs by AlN
monolayers. Vertical correlation in the position of the GaN QDs was also
studied by both grazing incidence MAD and anomalous Grazing Incidence Small
Angle Scattering (GISAXS) as a function of the number of GaN planes and of the
AlN spacer thickness. In a regime where the GaN QDs and the AlN capping are
mutually strain influenced, a vertical correlation in the position of QDs is
found with as a side-e ect an average increase in the QDs width.

2
The categories of this paper are: math
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat