TY - JOUR
T1 - Evidence for Dirac fermions in a honeycomb lattice based on silicon
AU - Chen, Lan
AU - Liu, Cheng Cheng
AU - Feng, Baojie
AU - He, Xiaoyue
AU - Cheng, Peng
AU - Ding, Zijing
AU - Meng, Sheng
AU - Yao, Yugui
AU - Wu, Kehui
PY - 2012/8/3
Y1 - 2012/8/3
N2 - Silicene, a sheet of silicon atoms in a honeycomb lattice, was proposed to be a new Dirac-type electron system similar to graphene. We performed scanning tunneling microscopy and spectroscopy studies on the atomic and electronic properties of silicene on Ag(111). An unexpected √3×√3 reconstruction was found, which is explained by an extra-buckling model. Pronounced quasiparticle interferences (QPI) patterns, originating from both the intervalley and intravalley scatter, 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.
AB - Silicene, a sheet of silicon atoms in a honeycomb lattice, was proposed to be a new Dirac-type electron system similar to graphene. We performed scanning tunneling microscopy and spectroscopy studies on the atomic and electronic properties of silicene on Ag(111). An unexpected √3×√3 reconstruction was found, which is explained by an extra-buckling model. Pronounced quasiparticle interferences (QPI) patterns, originating from both the intervalley and intravalley scatter, 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.
UR - http://www.scopus.com/inward/record.url?scp=84864588398&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.109.056804
DO - 10.1103/PhysRevLett.109.056804
M3 - Article
AN - SCOPUS:84864588398
SN - 0031-9007
VL - 109
JO - Physical Review Letters
JF - Physical Review Letters
IS - 5
M1 - 056804
ER -