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 Wang; Yao 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

doi:10.1103/PhysRevB.94.085127

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

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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 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 language	English (US)
Article number	085127
Journal	Physical Review B
Volume	94
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevB.94.085127
State	Published - Aug 15 2016

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.94.085127

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Belopolski, I., Xu, S. Y., Ishida, Y., Pan, X., Yu, P., Sanchez, D. S., Zheng, H., Neupane, M., Alidoust, N., Chang, G., Chang, T. R., Wu, Y., Bian, G., Huang, S. M., Lee, C. C., Mou, D., Huang, L., Song, Y., Wang, B., ... Hasan, M. Z. (2016). Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate Mox W1-xTe2. Physical Review B, 94(8), Article 085127. https://doi.org/10.1103/PhysRevB.94.085127

@article{f3b75434c52f4d01ad07d6c0657693bf,

title = "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.",

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

note = "Publisher Copyright: {\textcopyright} 2016 American Physical Society.",

year = "2016",

month = aug,

day = "15",

doi = "10.1103/PhysRevB.94.085127",

language = "English (US)",

volume = "94",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

number = "8",

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Belopolski, I, Xu, SY, Ishida, Y, Pan, X, Yu, P, Sanchez, DS, Zheng, H, Neupane, M, Alidoust, N, Chang, G, Chang, TR, Wu, Y, Bian, G, Huang, SM, Lee, CC, Mou, D, Huang, L, Song, Y, Wang, B, Wang, G, Yeh, YW, Yao, N, Rault, JE, Le Fèvre, P, Bertran, F, Jeng, HT, Kondo, T, Kaminski, A, Lin, H, Liu, Z, Song, F, Shin, S & Hasan, MZ 2016, 'Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate Mox W1-xTe2', Physical Review B, vol. 94, no. 8, 085127. https://doi.org/10.1103/PhysRevB.94.085127

TY - JOUR

T1 - Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate Mox W1-xTe2

AU - Belopolski, Ilya

AU - Xu, Su Yang

AU - Ishida, Yukiaki

AU - Pan, Xingchen

AU - Yu, Peng

AU - Sanchez, Daniel S.

AU - Zheng, Hao

AU - Neupane, Madhab

AU - Alidoust, Nasser

AU - Chang, Guoqing

AU - Chang, Tay Rong

AU - Wu, Yun

AU - Bian, Guang

AU - Huang, Shin Ming

AU - Lee, Chi Cheng

AU - Mou, Daixiang

AU - Huang, Lunan

AU - Song, You

AU - Wang, Baigeng

AU - Wang, Guanghou

AU - Yeh, Yao Wen

AU - Yao, Nan

AU - Rault, Julien E.

AU - Le Fèvre, Patrick

AU - Bertran, François

AU - Jeng, Horng Tay

AU - Kondo, Takeshi

AU - Kaminski, Adam

AU - Lin, Hsin

AU - Liu, Zheng

AU - Song, Fengqi

AU - Shin, Shik

AU - Hasan, M. Zahid

PY - 2016/8/15

Y1 - 2016/8/15

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevB.94.085127

DO - 10.1103/PhysRevB.94.085127

M3 - Article

AN - SCOPUS:84986004251

SN - 2469-9950

VL - 94

JO - Physical Review B

JF - Physical Review B

IS - 8

M1 - 085127

ER -

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

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