Evidence for Dirac Fermions in a Honeycomb Lattice Based on Silicon
Evidence for Dirac Fermions in a Honeycomb Lattice Based on Silicon
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基于硅的蜂窝晶格中狄拉克费米子的证据
DOI：
10.1103/physrevlett.109.056804
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发表时间：
2012-08-03
影响因子：
8.6
通讯作者：
Wu, Kehui
中科院分区：
文献类型：
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作者：
Chen, Lan;Liu, Cheng-Cheng;Wu, Kehui
硅烯是一种蜂窝晶格中的硅原子片，被认为是一种类似于石墨烯的新型狄拉克型电子系统。我们对Ag（111）上硅烯的原子和电子性质进行了扫描隧道显微镜和光谱学研究。发现了意想不到的根3 X根3重构，这可以用超屈曲模型来解释。观察到明显的准粒子干涉（QPI）模式，起源于谷间和通道内散射。从QPI模式中我们得到了线性能量-动量色散和较大的费米速度，证明了狄拉克费米子在硅中的存在。
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 root 3 X root 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.