Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate MoxW1-xTe2

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

doi:10.1103/PhysRevB.94.085127

Title: Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate ${Mo}_{x} W_{1 - x} {Te}_{2}$

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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 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 .

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 more »« less

Publication Date:: 2016-08-15

Research Org.:: Ames Lab., Ames, IA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1342950

Report Number(s):: IS-J 8989
Journal ID: ISSN 2469-9950; PRBMDO

DOE Contract Number:: FG-02-05ER46200; 26800165; AC02-07CH11358; 91421109; 11522432; 21571097; BK20130054; NRF-RF2013-08; NRF-NRFF2013-03; M4081137.070

Resource Type:: Journal Article

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 94; Journal Issue: 8; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    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, and Hasan, M. Zahid. Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate MoxW1-xTe2.  United States: N. p., 2016. 
        Web.  doi:10.1103/PhysRevB.94.085127.

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                    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. Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate MoxW1-xTe2.  United States.  https://doi.org/10.1103/PhysRevB.94.085127

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                    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, and Hasan, M. Zahid. 2016.  
        "Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate MoxW1-xTe2".  United States.  https://doi.org/10.1103/PhysRevB.94.085127.

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@article{osti_1342950,

  title        = {Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate MoxW1-xTe2},

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

  abstractNote = {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 .},

  doi          = {10.1103/PhysRevB.94.085127},

  url          = {https://www.osti.gov/biblio/1342950},
  journal      = {Physical Review B},

  issn         = {2469-9950},

  number       = 8,

  volume       = 94,

  place        = {United States},

  year         = {2016},

  month        = {8}

}

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Title: Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate Mo x W 1 - x Te 2

Abstract

Citation Formats

Title: Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate ${Mo}_{x} W_{1 - x} {Te}_{2}$