Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Engineering decomposition-resilience and de-coalescence of GaN nanowire
  ensembles   The rapidly increasing interest in nanowires (NWs) of GaN and associated
III-Nitrides for (opto-)electronic applications demands immediate addressal of
the technological challenges associated with both NW-growth and device
processing. Towards this end, we demonstrate in this work an approach to
suppress thermal decomposition of GaN NWs, which also serves to remedy the
effect of NW-coalescence during growth. While both these effects are well-known
to be major hurdles in the development of GaN-NW-devices, reliable methods to
tackle these issues have not been reported so far. We show that by providing a
thin AlN cap layer, which epitaxially grows only on the top-facet of the GaN
NWs, thermal decomposition can be almost completely suppressed. Thermal
annealing of GaN NW-ensembles, post AlN-capping, leads to selective
decomposition of uncapped/partially-capped NWs, leaving behind (mostly)
AlN-capped GaN NWs, with superior crystal- and luminescence characteristics.
This simple yet extremely effective approach may therefore serve as a very
crucial milestone in the roadmap of GaN-NW-based (opto-)electronic technology.

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The categories of this paper are: chem-ph
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph