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Scattering of surface electrons by isolated steps versus periodic step arrays

Ortega, J. E. ; Lobo-Checa, J. ; Peschel, G. ; Schirone, S. ; Abd El-Fattah, Z. M. ; Matena, M. ; Schiller, F. ; Borghetti, P. ; Gambardella, P. ; Mugarza, A.

Physical review. B, Condensed matter and materials physics, 2013-03, Vol.87 (11), Article 115425 [Periódico revisado por pares]

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  • Título:
    Scattering of surface electrons by isolated steps versus periodic step arrays
  • Autor: Ortega, J. E. ; Lobo-Checa, J. ; Peschel, G. ; Schirone, S. ; Abd El-Fattah, Z. M. ; Matena, M. ; Schiller, F. ; Borghetti, P. ; Gambardella, P. ; Mugarza, A.
  • Assuntos: Arrays ; Coherence ; Condensed matter ; Noble metals ; Scanning tunneling microscopy ; Scattering ; Superlattices ; Terraces
  • É parte de: Physical review. B, Condensed matter and materials physics, 2013-03, Vol.87 (11), Article 115425
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: We investigate the scattering of electrons belonging to Shockley states of (111)-oriented noble metal surfaces using angle-resolved photoemission (ARPES) and scanning tunneling microscopy (STM). Both ARPES and STM indicate that monatomic steps on a noble metal surface may act either as strongly repulsive or highly transmissive barriers for surface electrons, depending on the coherence of the step lattice, and irrespectively of the average step spacing. By measuring curved crystal surfaces with terrace length ranging from 30 to 180 [Angstrom], we show that vicinal surfaces of Au and Ag with periodic step arrays exhibit a remarkable wave function coherence beyond 100 [Angstrom] step spacings, well beyond the Fermi wavelength limit and independently of the projection of the bulk band gap on the vicinal plane. In contrast, the analysis of transmission resonances investigated by STM shows that a pair of isolated parallel steps defining a 58 [Angstrom] wide terrace confines and decouples the surface state of the small terrace from that of the (111) surface. We conclude that the formation of laterally confined quantum well states in vicinal surfaces as opposed to propagating superlattice states depends on the loss of coherence driven by imperfection in the superlattice order.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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