%0 Journal Article
%T Evidence for Dirac Fermions in a honeycomb lattice based on silicon
%A Lan Chen
%A Cheng-Cheng Liu
%A Baojie Feng
%A Xiaoyue He
%A Peng Cheng
%A Zijing Ding
%A Sheng Meng
%A Yugui Yao
%A Kehui Wu
%J Physics
%D 2012
%I arXiv
%R 10.1103/PhysRevLett.109.056804
%X Silicene, a sheet of silicon atoms in a honeycomb lattice, was proposed to be a new Dirac-type electron system similar as graphene. We performed scanning tunneling microscopy and spectroscopy studies on the atomic and electronic properties of silicene on Ag(111). An unexpected $\sqrt{3}\times \sqrt{3}$ reconstruction was found, which is explained by an extra-buckling model. Pronounced quasi-particle interferences (QPI) patterns, originating from both the intervalley and intravalley scattering, were observed. From the QPI patterns we derived a linear energy-momentum dispersion and a large Fermi velocity, which prove the existence of Dirac Fermions in silicene.
%U http://arxiv.org/abs/1204.2642v2