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A strongly robust type II Weyl fermion semimetal state in Ta3S2

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      A new methodology is used to design robust Weyl semimetals and to identify the most robust and ideal Weyl semimetal candidate in Ta3S2.


      Weyl semimetals are of great interest because they provide the first realization of the Weyl fermion, exhibit exotic quantum anomalies, and host Fermi arc surface states. The separation between Weyl nodes of opposite chirality gives a measure of the robustness of the Weyl semimetal state. To exploit the novel phenomena that arise from Weyl fermions in applications, it is crucially important to find robust separated Weyl nodes. We propose a methodology to design robust Weyl semimetals with well-separated Weyl nodes. Using this methodology as a guideline, we search among the material parameter space and identify by far the most robust and ideal Weyl semimetal candidate in the single-crystalline compound tantalum sulfide (Ta3S2) with new and novel properties beyond TaAs. Crucially, our results show that Ta3S2 has the largest k-space separation between Weyl nodes among known Weyl semimetal candidates, which is about twice larger than the measured value in TaAs and 20 times larger than the predicted value in WTe2. Moreover, all Weyl nodes in Ta3S2 are of type II. Therefore, Ta3S2 is a type II Weyl semimetal. Furthermore, we predict that increasing the lattice by <4% can annihilate all Weyl nodes, driving a novel topological metal-to-insulator transition from a Weyl semimetal state to a topological insulator state. The robust type II Weyl semimetal state and the topological metal-to-insulator transition in Ta3S2 are potentially useful in device applications. Our methodology can be generally applied to search for new Weyl semimetals.

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            Author and article information

            [1 ]Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore.
            [2 ]Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore.
            [3 ]Laboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ 08544, USA.
            [4 ]Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan.
            [5 ]Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan.
            [6 ]Department of Physics, Northeastern University, Boston, MA 02115, USA.
            Author notes

            These authors contributed equally to this work.

            []Corresponding author. Email: suyangxu@ (S.-Y.X.); nilnish@ (H.L.); mzhasan@ (M.Z.H.)
            Sci Adv
            Sci Adv
            Science Advances
            American Association for the Advancement of Science
            June 2016
            24 June 2016
            : 2
            : 6
            Copyright © 2016, The Authors

            This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

            Funded by: FundRef, Gordon and Betty Moore Foundation;
            Award ID: ID0EHWBI7830
            Award ID: GBMF4547
            Award Recipient :
            Funded by: National Research Foundation Singapore (SG);
            Award ID: ID0ES1BI7831
            Award ID: NRF-NRFF2013-03
            Award Recipient :
            Funded by: FundRef, Basic Energy Sciences;
            Award ID: ID0E16BI7832
            Award ID: DE-FG-02-05ER46200
            Award Recipient :
            Funded by: FundRef, Basic Energy Sciences;
            Award ID: ID0EFECI7833
            Award ID: DE-AC02-05CH11231
            Award Recipient :
            Research Article
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            Nielsen Santos

            fermi arc, weyl fermion, topology


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