Dispersion of surface bands and chain coupling at Si and Ge(111) surfaces (Articolo in rivista)

Type
Label
  • Dispersion of surface bands and chain coupling at Si and Ge(111) surfaces (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Bussetti, G; Goletti, C; Chlaradia, P; Rohlfing, M; Betti, MG; Bussolotti, F; Cirilli, S; Mariani, C; Kanjilal, A (2008)
    Dispersion of surface bands and chain coupling at Si and Ge(111) surfaces
    in Surface science
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Bussetti, G; Goletti, C; Chlaradia, P; Rohlfing, M; Betti, MG; Bussolotti, F; Cirilli, S; Mariani, C; Kanjilal, A (literal)
Pagina inizio
  • 1423 (literal)
Pagina fine
  • 1427 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 602 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \"[Bussetti, G.; Goletti, C.; Chlaradia, P.; Betti, M. G.; Bussolotti, F.; Cirilli, S.; Mariani, C.] Univ Roma Tor Vergata, Dipartimento Fis, I-00173 Rome, Italy; [Bussetti, G.; Goletti, C.; Chlaradia, P.; Betti, M. G.; Bussolotti, F.; Cirilli, S.; Mariani, C.] Univ Roma Tor Vergata, CNISM, I-00173 Rome, Italy; [Rohlfing, M.] Univ Osnabruck, Fachbereich Phys, D-4500 Osnabruck, Germany; [Kanjilal, A.] INFM, CNR, Ctr Nanostruct & Biosyst Surfaces S3, Modena, Italy; [Kanjilal, A.] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy (literal)
Titolo
  • Dispersion of surface bands and chain coupling at Si and Ge(111) surfaces (literal)
Abstract
  • The dispersion of quasi-one-dimensional dangling-bond electrons in pi-bonded chains at the Si(111)-2 x 1 and Ge(111)-2 x 1 surfaces has been experimentally investigated by angle-resolved photoemission spectroscopy, in the direction perpendicular to the chains, with a high energy and angle precision. The results show a very small dispersion in the case of Si(111)-2 x 1 and instead a much larger (downward) dispersion (156 meV) in the case of Ge(111)-2 x 1. Accurate density-functional calculations with GW corrections are in very good agreement with the experimental results. Then the surface chains are somewhat interacting in Ge(111)-2 x 1 - the coupling occurring mainly through the subsurface region - while in Si(111)-2 x 1 they are essentially decoupled. Therefore the one-dimensional character of electrons in surface chains is enhanced in Si(111)-2 x 1 with respect to Ge(111)-2 x 1. (c) 2008 Elsevier B. V. All rights reserved. (literal)
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