Atomic-Scale Visualization of Quasiparticle Interference on a Type-II Weyl Semimetal Surface

We combine quasiparticle interference simulation (theory) and atomic resolution scanning tunneling spectromicroscopy (experiment) to visualize the interference patterns on a type-II Weyl semimetal MoxW1-xTe2 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 Mo0.66W0.34Te2. 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.Gordon and Betty Moore Foundations EPiQS Initiative [GBMF4547]; U.S. National Science Foundation (NSF) [NSFDMR-1006492]; National Natural Science Foundation of China [11674226, 91421109, 11134005, 11522432]; National Research Foundation, Prime Ministers Office, Singapore [NRF-NRFF2013-03]; National Basic Research Program of China [2013CB921901, 2014CB239302]; Princeton Center for Complex Materials; NSF [DMR1420541]; Ministry of Science and Technology, Academia Sinica; National Tsing Hua University, Taiwan; National Key Projects for Basic Research of China [2013CB922103]; U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences [DE-FG02-07ER46352]; DOE [DE-AC02-05CH11231]SCI(E)ARTICLEmzhasan@princeton.edu2611