Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structural and optical properties of self-catalytic GaAs:Mn nanowires
  grown by molecular beam epitaxy on silicon substrates   Mn-doped GaAs nanowires were grown in the self-catalytic growth mode on
oxidized Si(100) surface by molecular beam epitaxy and characterized by
scanning and transmission electron microscopy, Raman scattering,
photoluminescence, cathodoluminescence, and electron transport measurements.
The transmission electron microscopy studies evidenced the substantial
accumulation of Mn inside the catalyzing Ga droplets at the top of the
nanowires. Optical and transport measurements revealed that the limit of Mn
content for self-catalysed growth of GaAs nanowires corresponds to the doping
level, i.e., is much lower than the Mn/Ga flux ratio (about 3%) used during the
MBE growth. The resistivity measurements of individual nanowires confirmed that
they are conductive, in accordance with the photoluminescence measurements
which showed the presence of Mn2+ acceptors located at Ga sites of the GaAs
host lattice of the nanowires. An anomalous temperature dependence of the
photoluminescence related to excitons was demonstrated for Mn-doped GaAs
nanowires.

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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: acc-phys
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
0
The categories of this paper are: hep-ph