Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photoluminescence of focused ion beam implanted
  Er$^{3+}$:Y$_{2}$SiO$_{5}$ crystals   Erbium doped low symmetry Y$_2$SiO$_5$ crystals attract a lot of attention in
perspective of quantum information applications. However, only doping of the
samples during growth is available up to now, which yields a quite homogeneous
doping density. In the present work, we deposit Er$^{3+}$-ions by the focused
ion beam technique at Yttrium sites with several fluences in one sample. With a
photoluminescence study of these locally doped Er$^{3+}$:Y$_2$SiO$_5$ crystals,
we are able to evaluate the efficiency of the implantation process and develop
it for the highest efficiency possible. We observe the dependence of the ion
activation after the post-implantation annealing on the fluence value.

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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: econ
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio