Discovery of a new type of topological Weyl fermion semimetal state in MoxW1-xTe2

Ilya Belopolski; Daniel S. Sanchez; Yukiaki Ishida; Xingchen Pan; Peng Yu; Su Yang Xu; Guoqing Chang; Tay Rong Chang; Hao Zheng; Nasser Alidoust; Guang Bian; Madhab Neupane; Shin Ming Huang; Chi Cheng Lee; You Song; Haijun Bu; Guanghou Wang; Shisheng Li; Goki Eda; Horng Tay Jeng; Takeshi Kondo; Hsin Lin; Zheng Liu; Fengqi Song; Shik Shin; M. Zahid Hasan

doi:10.1038/ncomms13643

Discovery of a new type of topological Weyl fermion semimetal state in Mo_xW_1-xTe₂

Ilya Belopolski, Daniel S. Sanchez, Yukiaki Ishida, Xingchen Pan, Peng Yu, Su Yang Xu, Guoqing Chang, Tay Rong Chang, Hao Zheng, Nasser Alidoust, Guang Bian, Madhab Neupane, Shin Ming Huang, Chi Cheng Lee, You Song, Haijun Bu, Guanghou Wang, Shisheng Li, Goki Eda, Horng Tay JengTakeshi Kondo, Hsin Lin, Zheng Liu, Fengqi Song, Shik Shin, M. Zahid Hasan

Department of Physics

Research output: Contribution to journal › Article › peer-review

163 Citations (Scopus)

Abstract

The recent discovery of a Weyl semimetal in TaAs offers the first Weyl fermion observed in nature and dramatically broadens the classification of topological phases. However, in TaAs it has proven challenging to study the rich transport phenomena arising from emergent Weyl fermions. The series Mo x W 1â 'x Te 2 are inversion-breaking, layered, tunable semimetals already under study as a promising platform for new electronics and recently proposed to host Type II, or strongly Lorentz-violating, Weyl fermions. Here we report the discovery of a Weyl semimetal in Mo x W 1â 'x Te 2 at x=25%. We use pump-probe angle-resolved photoemission spectroscopy (pump-probe ARPES) to directly observe a topological Fermi arc above the Fermi level, demonstrating a Weyl semimetal. The excellent agreement with calculation suggests that Mo x W 1â 'x Te 2 is a Type II Weyl semimetal. We also find that certain Weyl points are at the Fermi level, making Mo x W 1â 'x Te 2 a promising platform for transport and optics experiments on Weyl semimetals.

Original language	English
Article number	13643
Journal	Nature communications
Volume	7
DOIs	https://doi.org/10.1038/ncomms13643
Publication status	Published - 2016 Dec 5

All Science Journal Classification (ASJC) codes

General Chemistry
General Biochemistry,Genetics and Molecular Biology
General Physics and Astronomy

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Belopolski, I., Sanchez, D. S., Ishida, Y., Pan, X., Yu, P., Xu, S. Y., Chang, G., Chang, T. R., Zheng, H., Alidoust, N., Bian, G., Neupane, M., Huang, S. M., Lee, C. C., Song, Y., Bu, H., Wang, G., Li, S., Eda, G., ... Zahid Hasan, M. (2016). Discovery of a new type of topological Weyl fermion semimetal state in Mo_xW_1-xTe₂. Nature communications, 7, Article 13643. https://doi.org/10.1038/ncomms13643

@article{f51e0362a40e489896f1135263a949fe,

title = "Discovery of a new type of topological Weyl fermion semimetal state in MoxW1-xTe2",

abstract = "The recent discovery of a Weyl semimetal in TaAs offers the first Weyl fermion observed in nature and dramatically broadens the classification of topological phases. However, in TaAs it has proven challenging to study the rich transport phenomena arising from emergent Weyl fermions. The series Mo x W 1{\^a} 'x Te 2 are inversion-breaking, layered, tunable semimetals already under study as a promising platform for new electronics and recently proposed to host Type II, or strongly Lorentz-violating, Weyl fermions. Here we report the discovery of a Weyl semimetal in Mo x W 1{\^a} 'x Te 2 at x=25%. We use pump-probe angle-resolved photoemission spectroscopy (pump-probe ARPES) to directly observe a topological Fermi arc above the Fermi level, demonstrating a Weyl semimetal. The excellent agreement with calculation suggests that Mo x W 1{\^a} 'x Te 2 is a Type II Weyl semimetal. We also find that certain Weyl points are at the Fermi level, making Mo x W 1{\^a} 'x Te 2 a promising platform for transport and optics experiments on Weyl semimetals.",

author = "Ilya Belopolski and Sanchez, {Daniel S.} and Yukiaki Ishida and Xingchen Pan and Peng Yu and Xu, {Su Yang} and Guoqing Chang and Chang, {Tay Rong} and Hao Zheng and Nasser Alidoust and Guang Bian and Madhab Neupane and Huang, {Shin Ming} and Lee, {Chi Cheng} and You Song and Haijun Bu and Guanghou Wang and Shisheng Li and Goki Eda and Jeng, {Horng Tay} and Takeshi Kondo and Hsin Lin and Zheng Liu and Fengqi Song and Shik Shin and {Zahid Hasan}, M.",

note = "Publisher Copyright: {\textcopyright} The Author(s) 2016.",

year = "2016",

month = dec,

day = "5",

doi = "10.1038/ncomms13643",

language = "English",

volume = "7",

journal = "Nature communications",

issn = "2041-1723",

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Belopolski, I, Sanchez, DS, Ishida, Y, Pan, X, Yu, P, Xu, SY, Chang, G, Chang, TR, Zheng, H, Alidoust, N, Bian, G, Neupane, M, Huang, SM, Lee, CC, Song, Y, Bu, H, Wang, G, Li, S, Eda, G, Jeng, HT, Kondo, T, Lin, H, Liu, Z, Song, F, Shin, S & Zahid Hasan, M 2016, 'Discovery of a new type of topological Weyl fermion semimetal state in Mo_xW_1-xTe₂', Nature communications, vol. 7, 13643. https://doi.org/10.1038/ncomms13643

TY - JOUR

T1 - Discovery of a new type of topological Weyl fermion semimetal state in MoxW1-xTe2

AU - Belopolski, Ilya

AU - Sanchez, Daniel S.

AU - Ishida, Yukiaki

AU - Pan, Xingchen

AU - Yu, Peng

AU - Xu, Su Yang

AU - Chang, Guoqing

AU - Chang, Tay Rong

AU - Zheng, Hao

AU - Alidoust, Nasser

AU - Bian, Guang

AU - Neupane, Madhab

AU - Huang, Shin Ming

AU - Lee, Chi Cheng

AU - Song, You

AU - Bu, Haijun

AU - Wang, Guanghou

AU - Li, Shisheng

AU - Eda, Goki

AU - Jeng, Horng Tay

AU - Kondo, Takeshi

AU - Lin, Hsin

AU - Liu, Zheng

AU - Song, Fengqi

AU - Shin, Shik

AU - Zahid Hasan, M.

PY - 2016/12/5

Y1 - 2016/12/5

N2 - The recent discovery of a Weyl semimetal in TaAs offers the first Weyl fermion observed in nature and dramatically broadens the classification of topological phases. However, in TaAs it has proven challenging to study the rich transport phenomena arising from emergent Weyl fermions. The series Mo x W 1â 'x Te 2 are inversion-breaking, layered, tunable semimetals already under study as a promising platform for new electronics and recently proposed to host Type II, or strongly Lorentz-violating, Weyl fermions. Here we report the discovery of a Weyl semimetal in Mo x W 1â 'x Te 2 at x=25%. We use pump-probe angle-resolved photoemission spectroscopy (pump-probe ARPES) to directly observe a topological Fermi arc above the Fermi level, demonstrating a Weyl semimetal. The excellent agreement with calculation suggests that Mo x W 1â 'x Te 2 is a Type II Weyl semimetal. We also find that certain Weyl points are at the Fermi level, making Mo x W 1â 'x Te 2 a promising platform for transport and optics experiments on Weyl semimetals.

AB - The recent discovery of a Weyl semimetal in TaAs offers the first Weyl fermion observed in nature and dramatically broadens the classification of topological phases. However, in TaAs it has proven challenging to study the rich transport phenomena arising from emergent Weyl fermions. The series Mo x W 1â 'x Te 2 are inversion-breaking, layered, tunable semimetals already under study as a promising platform for new electronics and recently proposed to host Type II, or strongly Lorentz-violating, Weyl fermions. Here we report the discovery of a Weyl semimetal in Mo x W 1â 'x Te 2 at x=25%. We use pump-probe angle-resolved photoemission spectroscopy (pump-probe ARPES) to directly observe a topological Fermi arc above the Fermi level, demonstrating a Weyl semimetal. The excellent agreement with calculation suggests that Mo x W 1â 'x Te 2 is a Type II Weyl semimetal. We also find that certain Weyl points are at the Fermi level, making Mo x W 1â 'x Te 2 a promising platform for transport and optics experiments on Weyl semimetals.

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U2 - 10.1038/ncomms13643

DO - 10.1038/ncomms13643

M3 - Article

AN - SCOPUS:85003815230

SN - 2041-1723

VL - 7

JO - Nature communications

JF - Nature communications

M1 - 13643

ER -

Discovery of a new type of topological Weyl fermion semimetal state in Mo_xW_1-xTe₂

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