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Direct observation of Dirac cone in multilayer silicene intercalation compound CaSi2
Eiichi Noguchi1, Katsuaki Sugawara, Ritsuko Yaokawa
1Department of Physics, Tohoku University, Sendai, 980-8578, Japan.
Advanced Materials (Deerfield Beach, Fla.)
|December 16, 2014
Abstract:
Calcium-intercalated multilayer silicene CaSi2 exhibits a massless Dirac-cone π-electron-band dispersion like graphene, while the Dirac point is about 2 eV away from the Fermi level due to diiimide-based charge transfer from the Ca atoms to the silicene layers. This indicates that the graphene-like electronic structure with a massless Dirac cone is stably formed in the metal-intercalated multilayer silicene.
