Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarization fields in GaN/AlN nanowire heterostructures studied by Off
  axis holography   In this work, we present an off-axis holography study of GaN/AlN
heterostructured nanowires grown by plasma-assisted molecular-beam epitaxy. We
discuss the sample preparation of nanowire samples for electron holography and
combine potential profiles obtained using holography with theoretical
calculations of the projected potential in order to gain understanding of the
potential distribution in these nanostructures. The effects of surface states
are discussed

29
The categories of this paper are: funct-an
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con