多层硅烯插层化合物 CaSi2 中狄拉克锥的直接观测。
Direct observation of Dirac cone in multilayer silicene intercalation compound CaSi2.
机构信息
Department of Physics, Tohoku University, Sendai, 980-8578, Japan.
出版信息
Adv Mater. 2015 Feb 4;27(5):856-60. doi: 10.1002/adma.201403077. Epub 2014 Dec 15.
PMID:25502913
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.
摘要
钙插层多层硅烯 CaSi2 表现出类似于石墨烯的无质量狄拉克锥 π 电子能带色散，而狄拉克点由于 Ca 原子到硅烯层的二酰亚胺基电荷转移，距离费米能级约 2 eV。这表明在金属插层多层硅烯中稳定形成了具有无质量狄拉克锥的类石墨烯电子结构。
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