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arXiv · 1612.05208

Atomic-scale visualization of quasiparticle interference on a type-II Weyl semimetal surface

Hao Zheng·Guang Bian·Guoqing Chang·Hong Lu·Su-Yang Xu·Guangqiang Wang·Tay-Rong Chang·Songtian Zhang·Ilya Belopolski·Nasser Alidoust·Daniel S. Sanchez·Fengqi Song·Horng-Tay Jeng·Nan Yao·Arun Bansil·Shuang Jia·Hsin Lin·M. Zahid Hasan
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Abstract

We combine quasiparticle interference simulation (theory) and atomic resolution scanning tunneling spectro-microscopy (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.

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Hao Zheng, Guang Bian, Guoqing Chang, Hong Lu, Su-Yang Xu, Guangqiang Wang, Tay-Rong Chang, Songtian Zhang, Ilya Belopolski, Nasser Alidoust, Daniel S. Sanchez, Fengqi Song, Horng-Tay Jeng, Nan Yao, Arun Bansil, Shuang Jia, Hsin Lin, M. Zahid Hasan. 2016-12-15. Atomic-scale visualization of quasiparticle interference on a type-II Weyl semimetal surface. https://doi.org/10.1103/physrevlett.117.266804

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