Delocalized Surface State in Epitaxial Si(111) Film with Spontaneous √3 × √3 Superstructure

Scientific Reports
Jian ChenKehui Wu

Abstract

The "multilayer silicene" films were grown on Ag(111), with increasing thickness above 30 monolayers (ML). Scanning tunneling microscopy (STM) observations suggest that the "multilayer silicene" is indeed a bulk-like Si(111) film with a (√3 × √3)R30° honeycomb superstructure on surface. The possibility for formation of Si(111)(√3 × √3)R30°-Ag reconstruction on the surface can be distinctively ruled out by peeling off the surface layer with the STM tip. On this surface, delocalized surface state as well as linear energy-momentum dispersion was observed from quasiparticle interference patterns. Our results indicate that a bulklike silicon film with diamondlike structure can also host delocalized surface state, which is even more attractive for potential applications, such as new generation of nanodevices based on Si.

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Sep 26, 2012·Physical Review Letters·Lan ChenKehui Wu
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Feb 15, 2013·Physical Review Letters·Chun-Liang LinNoriaki Takagi

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Citations

Mar 23, 2017·Advanced Materials·Jincheng ZhuangYi Du
Dec 21, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Lan ChenKehui Wu
Jul 22, 2018·Advanced Science·Jincheng ZhuangYi Du
Feb 19, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·H MrezguiaJ-M Themlin

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Methods Mentioned

BETA
scanning tunneling microscopy
Raman

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