Surface compositional mapping of self-assembled InAs/GaAs quantum rings (Articolo in rivista)

Type
Label
  • Surface compositional mapping of self-assembled InAs/GaAs quantum rings (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.jcrysgro.2008.09.198 (literal)
Alternative label
  • Biasiol, G; Magri, R; Heun, S; Locatelli, A; Mentes, TO; Sorba, L (2009)
    Surface compositional mapping of self-assembled InAs/GaAs quantum rings
    in Journal of crystal growth
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Biasiol, G; Magri, R; Heun, S; Locatelli, A; Mentes, TO; Sorba, L (literal)
Pagina inizio
  • 1764 (literal)
Pagina fine
  • 1766 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 311 (literal)
Rivista
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
  • 1. CNR, INFM, TASC, Lab Nazl, I-34012 Trieste, Italy 2. CNR, INFM, S3, I-41100 Modena, Italy 3. Univ Modena & Reggio Emilia, I-41100 Modena, Italy 4. CNR, INFM, NEST, I-56127 Pisa, Italy 5. Scuola Normale Super Pisa, I-56127 Pisa, Italy 6. Sincrotrone Trieste SCpA, I-34012 Trieste, Italy (literal)
Titolo
  • Surface compositional mapping of self-assembled InAs/GaAs quantum rings (literal)
Abstract
  • The composition profile of self-assembled InAs/GaAs quantum rings is investigated both experimentally and theoretically. Our study is aimed at obtaining information on unburied rings, which cannot be directly accessed in cross-sectional analysis. Two-dimensional surface chemical maps obtained by X-ray photoemission electron microscopy reveal a non-uniform composition profile with a double structure composed of an In-rich core, corresponding to the central hole of the ring, surrounded by a rim with a stronger In-Ga intermixing. These results are substantiated by an atomistic model which, for a given shape, identifies the composition distribution that minimizes the elastic energy of the system, The good agreement between experiment and theory allows us to identify the minimization of strain energy as the main driving force for the formation of quantum rings. (literal)
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