Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Local-field effects in silicon nanoclusters   The effect of the local fields on the absorption spectra of silicon
nanoclusters (NCs), freestanding or embedded in SiO2, is investigated in the
DFT-RPA framework for different size and amorphization of the samples. We show
that local field effects have a great influence on the optical absorption of
the NCs. Their effect can be described by two separate contributions, both
arising from polarization effects at the NC interface. First, local fields
produce a reduction of the absorption that is stronger in the low energy limit.
This contribution is a direct consequence of the screening induced by
polarization effects on the incoming field. Secondly, local fields cause a blue
shift on the main absorption peak that has been explained in terms of
perturbation of the absorption resonance conditions. Both contributions do not
depend either on the NC diameter nor on its amorphization degree, while showing
a high sensitivity to the environment enclosing the NCs.

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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: astro-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph