Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dislocation contrast in cathodoluminescence and electron-beam induced
  current maps on GaN(0001)   We theoretically analyze the contrast observed at the outcrop of a threading
dislocation at the GaN(0001) surface in cathodoluminescence and electron-beam
induced current maps. We consider exciton diffusion and recombination including
finite recombination velocities both at the planar surface and at the
dislocation. Formulating the reciprocity theorem for this general case enables
us to provide a rigorous analytical solution of this diffusion-recombination
problem. The results of the calculations are applied to an experimental example
to determine both the exciton diffusion length and the recombination strength
of threading dislocations in a free-standing GaN layer with a dislocation
density of $6\times10^{5}$~cm$^{-2}$.

25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics