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Title: Discovery of a new type of topological Weyl fermion semimetal state in Mo x W1−xTe2
Authors: Yu, Peng
Pan, Xingchen
Belopolski, Ilya
Sanchez, Daniel S.
Ishida, Yukiaki
Xu, Su-Yang
Chang, Guoqing
Chang, Tay-Rong
Zheng, Hao
Alidoust, Nasser
Bian, Guang
Neupane, Madhab
Huang, Shin-Ming
Lee, Chi-Cheng
Song, You
Bu, Haijun
Wang, Guanghou
Li, Shisheng
Eda, Goki
Jeng, Horng-Tay
Kondo, Takeshi
Lin, Hsin
Liu, Zheng
Song, Fengqi
Shin, Shik
Hasan, M. Zahid
Keywords: DRNTU::Engineering::Materials
Electronic Properties and Materials
Topological Matter
Issue Date: 2016
Source: Belopolski, I., Sanchez, D. S., Ishida, Y., Pan, X., Yu, P., Xu, S.-Y., . . . Hasan, M. Z. (2016). Discovery of a new type of topological Weyl fermion semimetal state in Mo x W1−xTe2. Nature Communications, 7, 13643-. doi:10.1038/ncomms13643
Series/Report no.: Nature Communications
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 MoxW1−xTe2 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 MoxW1−xTe2 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 MoxW1−xTe2 is a Type II Weyl semimetal. We also find that certain Weyl points are at the Fermi level, making MoxW1−xTe2 a promising platform for transport and optics experiments on Weyl semimetals.
DOI: 10.1038/ncomms13643
Rights: © 2016 The Author(s) (Published by Nature Publishing Group). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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