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Atomic Structures of Silicene Layers Grown on Ag(111): Scanning Tunneling Microscopy and Noncontact Atomic Force Microscopy Observations

Abstract : Silicene, the considered equivalent of graphene for silicon, has been recently synthesized on Ag(111) surfaces. Following the tremendous success of graphene, silicene might further widen the horizon of two-dimensional materials with new allotropes artificially created. Due to stronger spin-orbit coupling, lower group symmetry and different chemistry compared to graphene, silicene presents many new interesting features. Here, we focus on very important aspects of silicene layers on Ag(111): First, we present scanning tunneling microscopy (STM) and non-contact Atomic Force Microscopy (nc-AFM) observations of the major structures of single layer and bi-layer silicene in epitaxy with Ag(111). For the (3 3 3) reconstructed first silicene layer nc-AFM represents the same lateral arrangement of silicene atoms as STM and therefore provides a timely experimental confirmation of the current picture of the atomic silicene structure. Furthermore, both nc-AFM and STM give a unifying interpretation of the second layer (!3 3 !3)R 6 306 structure. Finally, we give support to the conjectured possible existence of less stable, ,2% stressed, (!7 3 !7)R 6 19.16 rotated silicene domains in the first layer.
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https://hal-amu.archives-ouvertes.fr/hal-03246059
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Submitted on : Wednesday, June 2, 2021 - 10:56:40 AM
Last modification on : Monday, January 10, 2022 - 10:16:08 AM
Long-term archiving on: : Friday, September 3, 2021 - 6:45:43 PM

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Andrea Resta, Thomas Leoni, Clemens Barth, Alain Ranguis, Conrad Becker, et al.. Atomic Structures of Silicene Layers Grown on Ag(111): Scanning Tunneling Microscopy and Noncontact Atomic Force Microscopy Observations. Scientific Reports, Nature Publishing Group, 2013, 3, ⟨10.1038/srep02399⟩. ⟨hal-03246059⟩

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