title: Direct observation of Dirac cone in multilayer silicene intercalation compound CaSi2.
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.
authors.affiliation: Department of Physics, Tohoku University, Sendai, 980-8578, Japan.
authors.forename: Eiichi
authors.initials: E
authors.lastname: Noguchi
authors.forename: Katsuaki
authors.initials: K
authors.lastname: Sugawara
authors.forename: Ritsuko
authors.initials: R
authors.lastname: Yaokawa
authors.forename: Taro
authors.initials: T
authors.lastname: Hitosugi
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Nakano
authors.forename: Takashi
authors.initials: T
authors.lastname: Takahashi
keywords: angle-resolved photoemission spectroscopy (ARPES); dirac cone; fermi surface; intercalation; silicene