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Discovery of a new type of topological Weyl fermion semimetal state in Mo<sub>x</sub>W<sub>1-x</sub>Te<sub>2</sub> [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 13,643 : digital, PDF file
Additional Creators
Princeton University, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Here, 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.
Report Numbers
E 1.99:1361396
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Note
Published through SciTech Connect.
12/05/2016.
"ncomms13643"
Nature Communications 7 ISSN 2041-1723 AM
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.
Funding Information
FG02-05ER46200
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