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

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arxiv 1612.05208 v1 pith:44LTUTQC submitted 2016-12-15 cond-mat.mes-hall cond-mat.other

Hao Zheng , Guang Bian , Guoqing Chang , Hong Lu , Su-Yang Xu , Guangqiang Wang , Tay-Rong Chang , Songtian Zhang
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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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classification cond-mat.mes-hallcond-mat.other
keywords surfaceinterferencestatesquasiparticlerevealsscatteringsemimetalsimulation
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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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