Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 99: Scanning Probe Methods III
O 99.8: Vortrag
Freitag, 4. April 2014, 12:15–12:30, GER 38
The role of Si trimers in the Si/Pt(111) surface alloy — •M. Švec1, M. Ondráček1, P. Hapala1, P. Merino2, P. Mutombo1, M. Vondracek1, S. Polyak1, V. Chab1, M. Blanco-Rey3, P. de Andres3, J. A. M. Gago3, and P. Jelinek1 — 1FZÚ AVČR, Praha CZ — 2CAB-INTA, Madrid ES — 3ICMM-CSIC, Madrid ES
Silicon is deposited onto crystalline Pt and the resulting structure is investigated in a great detail. An ensemble of surface-science techniques (STM-AFM, ARUPS, SRPES, LEED-IV) is employed to characterize the system and to deduce an atomistic model for the complex geometry of the Si-(r19xr19)R23.4°/Pt(111) structure. Theoretical simulations achieve a very good agreement with the experimental techniques and corroborate beyond any doubt that it is a surface alloy. Generality of the model is briefly discussed, based on similarities found in analogous systems. These findings render unlikely any formation of silicene or germanene on Pt(111) and other noble metal surfaces.