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Silicene can be stabilized in various forms on Ag (111) surface and was recently integrated in field-effect transistors (FET) showing high mobility when Ag is withdrawn. However, strong hybridization effects in silicene superstructures on silver have been invoked as responsible for the disruption of its peculiar electronic properties. We investigate the role of the Ag (111) metallic support in determining the physical properties of the Si/Ag interface, by means of theoretical calculations of the optical response of the supported system. Ab initio simulations based on density functional theory show that the silicene/Ag (111) absorption spectra are strongly non-additive, while the presence of the silicene layer still produces a clear signature. Individual contributions to the spectra are singled out, allowing us to quantify the role of electronic transitions involving silver and silicon states. Silver states, in particular …
Publication date: 
15 Dec 2015

G Fratesi, E Cinquanta, S Dal Conte, C Grazianetti, F Scotognella, S Stagira, C Vozzi, A Molle, G Onida

Biblio References: 
International Meeting on Silicene