Tuesday, June 25, 2013

1306.5523 (Zsolt Majzik et al.)

Combined AFM and STM measurements of a silicene sheet grown on Ag(111)

Zsolt Majzik, Mohamed Rachid Tchalala, Martin Švec, Prokop Hapala, Hanna Enriquez, Abdelkader Kara, Andrew J. Mayne, Gérald Dujardin, Pavel Jelínek, Hamid Oughaddou
In this Letter, we present the first non-contact atomic force microscopy (nc-AFM) of a silicene on silver (Ag) surface, obtained by combining non-contact atomic force microscopy (nc-AFM) and scanning tunneling microscopy (STM). STM images over large areas of silicene grown on Ag(111) surface show both (sqrt13xsqrt13)R13.9{\deg} and (4x4) superstructures. For the widely observed (4x4) structure, the nc-AFM topography shows an atomic-scale contrast inversion as the tip-surface distance is decreased. At the shortest tip-surface distance, the nc-AFM topography is very similar to the STM one. The observed structure in the nc-AFM topography is compatible with only one out of two silicon atoms being visible. This indicates unambiguously a strong buckling of the silicene honeycomb layer.
View original: http://arxiv.org/abs/1306.5523

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