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Nat Commun. 2016 Feb 15;7:10639. doi: 10.1038/ncomms10639.

Prediction of an arc-tunable Weyl Fermion metallic state in Mo(x)W(1-x)Te2.

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Department of Physics, National Tsing Hua University, 30013 Hsinchu, Taiwan.
Laboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton University, Princeton, 08544 New Jersey, USA.
Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, 117546 Singapore, Singapore.
Department of Physics, National University of Singapore, 2 Science Drive 3, 117542 Singapore, Singapore.
Department of Physics, Northeastern University, Boston, 02115 Massachusetts, USA.
Condensed Matter and Magnet Science Group, Los Alamos National Laboratory, Los Alamos, 87545 New Mexico, USA.
Institute of Physics, Academia Sinica, 11529 Taipei, Taiwan.
Princeton Center for Complex Materials, Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, 08544 New Jersey, USA.


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 Mo(x)W(1-x)Te2 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 Mo(x)W(1-x)Te2, where non-saturating magneto-resistance and pressure-driven superconductivity have been observed.

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