Observation of Fermi Arcs in Type-II Weyl Semimetal Candidate WTe2

Abstract

We use ultrahigh resolution, tunable, vacuum ultraviolet laser angle-resolved photoemission spectroscopy (ARPES) to study the electronic properties of WTe${}_2$, a material that was predicted to be a type-II Weyl semimetal. The Weyl fermion states in WTe2 were proposed to emerge at the crossing points of electron and hole pockets; and Fermi arcs connecting electron and hole pockets would be visible in the spectral function on (001) surface. Here we report the observation of such Fermi arcs in WTe2 confirming the theoretical predictions. This provides strong evidence for type-II Weyl semimetallic states in WTe2.

5 pages, 4 figures

References in corpus (8)

• Titanic Magnetoresistance in WTe2
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Spectroscopic evidence for type II Weyl semimetal state in MoTe2
• Linear magnetoresistance caused by mobility fluctuations in the n-doped Cd3As2
• Discovery of Dirac Node Arcs in PtSn4
• Electronic structure basis for the titanic magnetoresistance in WTe${}_2$
• Observation of Large Topologically Trivial Fermi-Arcs in the Candidate Type-II Weyl Semimetal WTe2
• Measuring Chern numbers above the Fermi level in the Type II Weyl semimetal Mo${}_x$W${}_{1-x}$Te${}_2$

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