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Persistent Dirac Fermion State on Bulk-like Si(111) Surface

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arxiv 1405.7534 v1 pith:D6OKRAZB submitted 2014-05-29 cond-mat.mes-hall cond-mat.mtrl-sci

Jian Chen , Wenbin Li , Baojie Feng , Peng Cheng , Jinglan Qiu , Lan Chen , Kehui Wu This is my paper · ORCID
classification cond-mat.mes-hallcond-mat.mtrl-sci
keywords surfacediracsilicenestatebulkfermionsfilmmultilayer
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The "multilayer silicene" films were grown on Ag(111), with increasing thickness above 30 monolayers (ML). We found that the "multilayer silicene" is indeed a bulk Si(111) film. Such Si film on Ag(111) always exhibits a root(3)xroot(3) honeycomb superstructure on surface. Delocalized surface state as well as linear energy-momentum dispersion was revealed by quasiparticle interference patterns (QPI) on the surface, which proves the existence of Dirac fermions state. Our results indicate that bulk silicon with diamond structure can also host Dirac fermions, which makes the system even more attractive for further applications compared with monolayer silicene.

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