II型外尔半金属表面准粒子干涉的原子尺度可视化
Atomic-Scale Visualization of Quasiparticle Interference on a Type-II Weyl Semimetal Surface.
作者信息
Zheng Hao, Bian Guang, Chang Guoqing, Lu Hong, Xu Su-Yang, Wang Guangqiang, Chang Tay-Rong, Zhang Songtian, Belopolski Ilya, Alidoust Nasser, Sanchez Daniel S, Song Fengqi, Jeng Horng-Tay, Yao Nan, Bansil Arun, Jia Shuang, Lin Hsin, Hasan M Zahid
机构信息
Laboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore.
出版信息
Phys Rev Lett. 2016 Dec 23;117(26):266804. doi: 10.1103/PhysRevLett.117.266804.
We combine quasiparticle interference simulation (theory) and atomic resolution scanning tunneling spectromicroscopy (experiment) to visualize the interference patterns on a type-II Weyl semimetal Mo_{x}W_{1-x}Te_{2} for the first time. Our simulation based on first-principles band topology theoretically reveals the surface electron scattering behavior. We identify the topological Fermi arc states and reveal the scattering properties of the surface states in Mo_{0.66}W_{0.34}Te_{2}. In addition, our result reveals an experimental signature of the topology via the interconnectivity of bulk and surface states, which is essential for understanding the unusual nature of this material.
我们首次将准粒子干涉模拟（理论）与原子分辨率扫描隧道光谱显微镜（实验）相结合，以可视化II型外尔半金属MoₓW₁₋ₓTe₂上的干涉图案。我们基于第一性原理能带拓扑的模拟从理论上揭示了表面电子散射行为。我们识别出拓扑费米弧态，并揭示了Mo₀.₆₆W₀.₃₄Te₂中表面态的散射特性。此外，我们的结果通过体态与表面态的连通性揭示了拓扑的实验特征，这对于理解这种材料的特殊性质至关重要。
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