Surface Fermi arc connectivity in the type-II Weyl semimetal candidate WTe${}_2$

Abstract

We perform ultrahigh resolution angle-resolved photoemission experiments at a temperature T=0.8 K on the type-II Weyl semimetal candidate WTe${}_2$. We find a surface Fermi arc connecting the bulk electron and hole pockets on the (001) surface. Our results show that the surface Fermi arc connectivity to the bulk bands is strongly mediated by distinct surface resonances dispersing near the border of the surface-projected bulk band gap. By comparing the experimental results to first-principles calculations we argue that the coupling to these surface resonances, which are topologically trivial, is compatible with the classification of WTe${}_2$ as a type-II Weyl semimetal hosting topological Fermi arcs. We further support our conclusion by a systematic characterization of the bulk and surface character of the different bands and discuss the similarity of our findings to the case of topological insulators.

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Cited by in corpus (6)

• Observation of Weyl nodes in robust type-II Weyl semimetal WP2
• Electronic properties of type-II Weyl semimetal WTe${}_2$. A review perspective
• Coexistence of New Fermions in Topological Semimetal TaS
• Engineering Dirac states in graphene: Coexisting type-I and type-II Floquet-Dirac fermions
• Evidence of Electron-Hole Imbalance in WTe2 from High-Resolution Angle-Resolved Photoemission Spectroscopy
• Temperature independent band structure of WTe2 as observed from ARPES