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Prediction of an arc-tunable Weyl Fermion metallic state in MoxW1−xTe2

Author(s): Chang, Tay-Rong; Xu, Su-Yang; Chang, Guoqing; Lee, Chi-Cheng; Huang, Shin-Ming; et al

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Abstract: A Weyl semimetal is a new state of matter that hosts Weyl fermions as emergent quasiparticles. The Weyl fermions correspond to isolated points of bulk band degeneracy, Weyl nodes, which are connected only through the crystal’s boundary by exotic Fermi arcs. The length of the Fermi arc gives a measure of the topological strength, because the only way to destroy the Weyl nodes is to annihilate them in pairs in the reciprocal space. To date, Weyl semimetals are only realized in the TaAs class. Here, we propose a tunable Weyl state in MoxW1 xTe2 where Weyl nodes are formed by touching points between metallic pockets. We show that the Fermi arc length can be changed as a function of Mo concentration, thus tuning the topological strength. Our results provide an experimentally feasible route to realizing Weyl physics in the layered compound MoxW1 xTe2, where non-saturating magneto-resistance and pressure-driven superconductivity have been observed.
Publication Date: 15-Feb-2016
Electronic Publication Date: 15-Feb-2016
Citation: Chang, Tay-Rong, Xu, Su-Yang, Chang, Guoqing, Lee, Chi-Cheng, Huang, Shin-Ming, Wang, BaoKai, Bian, Guang, Zheng, Hao, Sanchez, Daniel S, Belopolski, Ilya, Alidoust, Nasser, Neupane, Madhab, Bansil, Arun, Jeng, Horng-Tay, Lin, Hsin, Hasan, M. Zahid (2016). Prediction of an arc-tunable Weyl Fermion metallic state in MoxW1−xTe2. Nature Communications, 7, 10639 (1 - 9). doi:10.1038/ncomms10639
DOI: doi:10.1038/ncomms10639
EISSN: 2041-1723
Pages: 10639 - 10639 (1 - 9)
Type of Material: Journal Article
Journal/Proceeding Title: Nature Communications
Version: Final published version. This is an open access article.

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