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Title: Discovery of a new type of topological Weyl fermion semimetal state in MoxW1-xTe2
Authors: 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 
Jeng, H.-T
Kondo, T
Lin, H 
Liu, Z
Song, F
Shin, S
Zahid Hasan, M
Keywords: chemical compound
experimental study
optical method
Issue Date: 2016
Publisher: Nature Publishing Group
Citation: 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, Jeng, H.-T, 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 MoxW1-xTe2. Nature Communications 7 : 13643. ScholarBank@NUS Repository.
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. © The Author(s) 2016.
Source Title: Nature Communications
ISSN: 20411723
DOI: 10.1038/ncomms13643
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