Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Insights into image contrast from dislocations in ADF-STEM   Competitive mechanisms contribute to image contrast from dislocations in
annular dark field scanning transmission electron microscopy ADF STEM. A clear
theoretical understanding of the mechanisms underlying the ADF STEM contrast is
therefore essential for correct interpretation of dislocation images. This
paper reports on a systematic study of the ADF STEM contrast from dislocations
in a GaN specimen, both experimentally and computationally. Systematic
experimental ADF STEM images of the edge character dislocations revealed a
number of characteristic contrast features that are shown to depend on both the
angular detection range and specific position of the dislocation in the sample.
A theoretical model based on electron channelling and Bloch wave scattering
theories, supported by multislice simulations using Grillo s strain channelling
equation, is proposed to elucidate the physical origin of such complex contrast
phenomena.

24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an