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Nature Research, Nature Communications, 1(7), 2016

DOI: 10.1038/ncomms10639

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

Journal article published in 2016 by Tay-Rong Chang, Su-Yang Xu, Guoqing Chang ORCID, Chi-Cheng Lee, Shin-Ming Huang ORCID, BaoKai Wang ORCID, Guang Bian ORCID, Hao Zheng ORCID, Daniel S. Sanchez, Ilya Belopolski, Nasser Alidoust, Madhab Neupane, Arun Bansil ORCID, Horng-Tay Jeng, Hsin Lin and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractA 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.