Fermi Arc Electronic Structure And Chern Numbers In The Type-Ii Weyl Semimetal Candidate Mox W1-Xte2

Abstract

It has recently been proposed that electronic band structures in crystals can give rise to a previously overlooked type of Weyl fermion, which violates Lorentz invariance and, consequently, is forbidden in particle physics. It was further predicted that MoxW1-xTe2 may realize such a type-II Weyl fermion. Here, we first show theoretically that it is crucial to access the band structure above the Fermi level F to show a Weyl semimetal in MoxW1-xTe2. Then, we study MoxW1-xTe2 by pump-probe ARPES and we directly access the band structure >0.2 eV above F in experiment. By comparing our results with ab initio calculations, we conclude that we directly observe the surface state containing the topological Fermi arc. We propose that a future study of MoxW1-xTe2 by pump-probe ARPES may directly pinpoint the Fermi arc. Our work sets the stage for the experimental discovery of the first type-II Weyl semimetal in MoxW1-xTe2.

Publication Date

8-15-2016

Publication Title

Physical Review B

Volume

94

Issue

8

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1103/PhysRevB.94.085127

Socpus ID

84986004251 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84986004251

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