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Discovery of a new type of topological Weyl fermion semimetal state in MoxW1 (-) Te-x(2)

TitleDiscovery of a new type of topological Weyl fermion semimetal state in MoxW1 (-) Te-x(2)
Publication TypeJournal Article
Year of Publication2016
AuthorsBelopolski, Ilya, Sanchez Daniel S., Ishida Yukiaki, Pan Xingchen, Yu Peng, 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, and Hasan Zahid M.
JournalNat. Commun.
Date Published12/2016
Keywordsarcs, augmented-wave method, crystal, energy-bands, mote2, quantum spin hall, single dirac cone, surface, transition-metal dichalcogenides, wannier functions

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.


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