Mohamed Rachid Tchalal, Hanna Enriquez, Andrew J. Mayne, Abdelkader Kara, Silvan Roth, Mathieu G. Silly, Azzedine Bendounan, Fausto Sirotti, Thomas Greber, Bernard Aufray, Gérald Dujardin, Mustapha Ait Ali, Hamid Oughaddou
We report results on the self-assembly of silicon nanoribbons on the (2x1) reconstructed Au(110) surface under ultra-high vacuum conditions. Upon adsorption of 0.2 monolayer (ML) of silicon the (2x1) reconstruction of Au(110) is replaced by an ordered surface alloy. Above this coverage a new superstructure is revealed by low electron energy diffraction (LEED) which becomes sharper at 0.3 Si ML. This superstructure corresponds to Si nanoribbons all oriented along the [-110] direction as revealed by LEED and scanning tunneling microscopy (STM). STM and high-resolution photoemission spectroscopy indicate that the nanoribbons are flat and predominantly 1.6 nm wide. In addition the silicon atoms show signatures of two chemical environments corresponding to the edge and center of the ribbons.
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http://arxiv.org/abs/1302.3391
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