Local-field effects in silicon nanoclusters (Articolo in rivista)

Type
Label
  • Local-field effects in silicon nanoclusters (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.84.075342 (literal)
Alternative label
  • Guerra, Roberto; Marsili, Margherita; Pulci, Olivia; Ossicini, Stefano (2011)
    Local-field effects in silicon nanoclusters
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Guerra, Roberto; Marsili, Margherita; Pulci, Olivia; Ossicini, Stefano (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 84 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 7 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 7 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Universita di Modena e Reggio Emilia; Universita di Modena e Reggio Emilia; CNR Ist Nanosci; University of Rome Tor Vergata; Consiglio Nazionale delle Ricerche (CNR NANO) (literal)
Titolo
  • Local-field effects in silicon nanoclusters (literal)
Abstract
  • The effect of the local fields on the absorption spectra of silicon nanoclusters (NCs), freestanding or embedded in SiO(2), 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. (literal)
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