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Initial pseudo-steady state & asymptotic KPZ universality in semiconductor on polymer deposition

Almeida, Renan A L ; Ferreira, Sukarno O ; Ferraz, Isnard ; Oliveira, Tiago J

Scientific reports, 2017-06, Vol.7 (1), p.3773-10, Article 3773 [Periódico revisado por pares]

England: Nature Publishing Group

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  • Título:
    Initial pseudo-steady state & asymptotic KPZ universality in semiconductor on polymer deposition
  • Autor: Almeida, Renan A L ; Ferreira, Sukarno O ; Ferraz, Isnard ; Oliveira, Tiago J
  • Assuntos: Atomic force microscopy ; Growth models ; Scaling ; Spatial distribution ; Statistics ; Vacuum
  • É parte de: Scientific reports, 2017-06, Vol.7 (1), p.3773-10, Article 3773
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
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  • Descrição: The Kardar-Parisi-Zhang (KPZ) class is a paradigmatic example of universality in nonequilibrium phenomena, but clear experimental evidences of asymptotic 2D-KPZ statistics are still very rare, and far less understanding stems from its short-time behavior. We tackle such issues by analyzing surface fluctuations of CdTe films deposited on polymeric substrates, based on a huge spatio-temporal surface sampling acquired through atomic force microscopy. A pseudo-steady state (where average surface roughness and spatial correlations stay constant in time) is observed at initial times, persisting up to deposition of ~10 monolayers. This state results from a fine balance between roughening and smoothening, as supported by a phenomenological growth model. KPZ statistics arises at long times, thoroughly verified by universal exponents, spatial covariance and several distributions. Recent theoretical generalizations of the Family-Vicsek scaling and the emergence of log-normal distributions during interface growth are experimentally confirmed. These results confirm that high vacuum vapor deposition of CdTe constitutes a genuine 2D-KPZ system, and expand our knowledge about possible substrate-induced short-time behaviors.
  • Editor: England: Nature Publishing Group
  • Idioma: Inglês
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