• DOI:10.1103/PhysRevB.96.165125
• Corpus ID: 119056180

Quasiparticle interference of surface states in the type-II Weyl semimetal WTe2

@article{Zhang2017QuasiparticleIO,
  title={Quasiparticle interference of surface states in the type-II Weyl semimetal WTe2},
  author={Wenhan Zhang and Quansheng Wu and Lunyong Zhang and Sang‐Wook Cheong and Alexey A. Soluyanov and Weida Wu},
  journal={Physical Review B},
  year={2017},
  volume={96}
}

• Wenhan Zhang, Quansheng Wu, +3 authors Weida Wu
• Published 31 May 2017
• Physics
• Physical Review B

Topological Weyl semimetal (TWS) is a metal, where low energy excitations behave like Weyl fermions of high-energy physics. It was recently shown that due to the lower symmetry of condensed matter systems, they can realize two distinct types of Weyl fermions. The type-I Weyl fermion in a metal is formed by a linear crossing of two bands at a point in the crystalline momentum space - Brillouin zone (BZ). The second type TWSs host type-II Weyl points appearing at the touching points of electron and hole pockets, which is a result of tilted linear dispersion. The type-II TWS was predicted to exist in several compounds, including WTe$_2$. Several ARPES studies of WTe$_2$ were reported so far, having contradictory conclusions on the topological nature of observed Fermi arcs. In this work, we report the results of spectroscopic imaging with a scanning tunneling microscope and first principle calculations, establishing a clear quasiparticle interference features of the surface states of WTe$_2$. Our work provides a strong evidence for surface state scattering. Although the surface Fermi arcs are clearly observed, it is still difficult to prove the existence of predicted Type-II Weyl points in the bulk.