Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate Mox W 1-xTe2

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 Mo x W 1 - x Te 2 may realize such a type-II W...

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Published in:Physical review. B 2016-08, Vol.94 (8)
Main Authors: Belopolski, Ilya, Xu, Su-Yang, Ishida, Yukiaki, Pan, Xingchen, Yu, Peng, Sanchez, Daniel S., Zheng, Hao, Neupane, Madhab, Alidoust, Nasser, Chang, Guoqing, Chang, Tay-Rong, Wu, Yun, Bian, Guang, Huang, Shin-Ming, Lee, Chi-Cheng, Mou, Daixiang, Huang, Lunan, Song, You, Wang, Baigeng, Wang, Guanghou, Yeh, Yao-Wen, Yao, Nan, Rault, Julien E., Le Fèvre, Patrick, Bertran, François, Jeng, Horng-Tay, Kondo, Takeshi, Kaminski, Adam, Lin, Hsin, Liu, Zheng, Song, Fengqi, Shin, Shik, Hasan, M. Zahid
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Language:English
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Summary: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 Mo x W 1 - x Te 2 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 ε F to show a Weyl semimetal in Mo x W 1 - x Te 2 . Then, we study Mo x W 1 - x Te 2 by pump-probe ARPES and we directly access the band structure > 0.2 eV above ε 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 Mo x W 1 - x Te 2 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 Mo x W 1 - x Te 2 .
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.94.085127