First-principles optical properties of silicon and germanium nanowires (Articolo in rivista)

Type
Label
  • First-principles optical properties of silicon and germanium nanowires (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Bruno, M; Palummo, M; Ossicini, S; Del Sole, R (2007)
    First-principles optical properties of silicon and germanium nanowires
    in Surface science
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Bruno, M; Palummo, M; Ossicini, S; Del Sole, R (literal)
Pagina inizio
  • 2707 (literal)
Pagina fine
  • 2711 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 601 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Roma Tor Vergata, Dipartimento Fis, CNISM, ETSF, I-00133 Rome, Italy; CNR, INFM, Rome, Italy; Univ Modena, INFM, S3, Dipartimento Sci & Metodi Ingn, I-41100 Modena, Italy (literal)
Titolo
  • First-principles optical properties of silicon and germanium nanowires (literal)
Abstract
  • In this work we study the optical properties of hydrogen-passivated, free-standing silicon and germanium nanowires, oriented along the [I 00] [I I 0] [I I I I directions with diameters up to about 1.5 nm, using ab-initio techniques. In particular, we show how the electronic gap depends on wire's size and orientation; such behaviour has been described in terms of quantum confinement and anisotropy effects, related to the quasi one-dimensionality of nanowires. The optical properties are analyzed taking into account different approximations: in particular, we show how the many-body effects, namely self-energy, local field and excitonic effects, strongly modify the single particle spectra. Further, we describe the differences in the optical spectra of silicon and germanium nanowires along the [100] direction, as due to the different band structures of the corresponding bulk compounds. (C) 2007 Elsevier B.V. All rights reserved. (literal)
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