Quasiparticle Interference of Surface States in Type-II Weyl Semimetal WTe${}_2$

Abstract

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.

11 pages, 3 figures

References in corpus (7)

• Titanic Magnetoresistance in WTe2
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Topological response in Weyl semimetals and the chiral anomaly
• Chiral anomaly and transport in Weyl metals
• Electronic structure basis for the titanic magnetoresistance in WTe${}_2$
• Weyl semimetals from noncentrosymmetric topological insulators
• Atomic-scale visualization of quasiparticle interference on a type-II Weyl semimetal surface

Cited by in corpus (15)

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• Probing topological quantum matter with scanning tunnelling microscopy
• Evidence of Higher Order Topology in Multilayer WTe${}_2$ from Josephson Coupling through Anisotropic Hinge States
• Quasiparticle interference on type-I and type-II Weyl semimetal surfaces: a review
• Experimental Progress on Layered Topological Semimetals
• Spin-, time- and angle-resolved photoemission spectroscopy on WTe${}_2$
• Universal response of the type-II Weyl semimetals phase diagram
• Searching for topological Fermi arcs via quasiparticle interference on a type-II Weyl semimetal MoTe${}_2$
• Surface Green's functions and quasiparticle interference in Weyl semimetals
• Pressure-induced creation and annihilation of Weyl points in Td- and 1T"-Mo0.5W0.5Te2
• Design and performance of an ultrahigh vacuum spectroscopic-imaging scanning tunneling microscope with a hybrid vibration isolation system
• Terahertz control of surface topology probed with subatomic resolution
• Selective observation of surface and bulk bands in polar WTe2 by laser-based spin- and angle-resolved photoemission spectroscopy
• Electronic band structure from quasiparticle interference and Landau quantization in WTe${}_2$
• Visualizing superconductivity in an inversion-symmetry-broken doped Weyl semimetal