Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate Mox W1-xTe2

Ilya Belopolski, Su Yang Xu, Yukiaki Ishida, Xingchen Pan, Peng Yu, Daniel S. Sanchez, Hao Zheng, Madhab Neupane, Nasser Alidoust, Guoqing Chang, Tay Rong Chang, Yun Wu, Guang Bian, Shin Ming Huang, Chi Cheng Lee, Daixiang Mou, Lunan Huang, You Song, Baigeng Wang, Guanghou WangYao Wen Yeh, Nan Yao, Julien E. Rault, Patrick Le Fèvre, François Bertran, Horng Tay Jeng, Takeshi Kondo, Adam Kaminski, Hsin Lin, Zheng Liu, Fengqi Song, Shik Shin, M. Zahid Hasan

Research output: Contribution to journalArticlepeer-review

93 Citations (Scopus)

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.

Original languageEnglish
Article number085127
JournalPhysical Review B
Volume94
Issue number8
DOIs
Publication statusPublished - 2016 Aug 15

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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