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Accueil du site > À la une > Si Nanoribbons on Ag(110) Studied by Grazing-Incidence X-Ray Diffraction, Scanning Tunneling Microscopy and Density-Functional Theory : Evidence of a Pentamer Chain Structure

Si Nanoribbons on Ag(110) Studied by Grazing-Incidence X-Ray Diffraction, Scanning Tunneling Microscopy and Density-Functional Theory : Evidence of a Pentamer Chain Structure

Geoffroy Prévot, Conor Hogan, Thomas Leoni, Romain Bernard, Eric Moyen, Laurence Masson

PRL 117, 276102 (2016)

Since the discovery in 2005 of the synthesis of Si nanoribbons (NRs) on Ag(110) upon Si deposition at room temperature (RT), a long debate concerning the atomic structure of these NRs began after the reported graphene-like electronic signature measured by angle-resolved photoelectron spectroscopy (ARPES) and attributed to the silicene character of the Si NRs. Si NRs with a width of 0.8 nm are randomly distributed on silver terraces or self-assembled in a (5x2) unit cell to form a 2D single-atom-thick Si layer composed of regularly spaced NRs with a width of 1.6 nm, for Si deposition at RT and 460 K, respectively. In this PRL, we report a combined theoretical (DFT calculations) and experimental (STM, GIXD) study which unambiguously elucidates the atomic structure of the Si NRs, among the numerous models proposed in the literature. The Si NRs correspond to an original Si phase composed of pentamer chains lying in the missing rows of the reconstructed Ag(110) surface. The work is issued from a collaboration between Geoffroy Prévot (INSP-Paris), Conor Hogan (CNR-ISM-Rome) and Laurence Masson.

JPG - 69.8 ko

Figure : a) STM image of Si nanoribbons (NRs) below completion of the Si monolayer.
I = 480 pA, Vsample = 40 mV. The atomic rows of Ag(110) are visible. b) Schematic model of a Si NR on the missing row reconstructed Ag(110) surface and the corresponding simulated STM image.