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

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.

To appear in Phys. Rev. Lett

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• Quantum Transport in Topological Semimetals under Magnetic Fields
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• Type-II topological metals
• A Weyl-${\mathrm{Z}}_2$ semimetal from holography
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• Design and performance of an ultrahigh vacuum spectroscopic-imaging scanning tunneling microscope with a hybrid vibration isolation system
• Manipulation of Weyl Points in Reciprocal and Nonreciprocal Mechanical Lattices
• Highly Mobile Carriers in a Candidate of Quasi-Two-Dimensional Topological Semimetal AuTe${}_2$Br
• Optical response in Weyl semimetal in model with gapped Dirac phase
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