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      Topological nodal-line fermions in spin-orbit metal PbTaSe 2

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          Abstract

          Topological semimetals can support one-dimensional Fermi lines or zero-dimensional Weyl points in momentum space, where the valence and conduction bands touch. While the degeneracy points in Weyl semimetals are robust against any perturbation that preserves translational symmetry, nodal lines require protection by additional crystalline symmetries such as mirror reflection. Here we report, based on a systematic theoretical study and a detailed experimental characterization, the existence of topological nodal-line states in the non-centrosymmetric compound PbTaSe 2 with strong spin-orbit coupling. Remarkably, the spin-orbit nodal lines in PbTaSe 2 are not only protected by the reflection symmetry but also characterized by an integer topological invariant. Our detailed angle-resolved photoemission measurements, first-principles simulations and theoretical topological analysis illustrate the physical mechanism underlying the formation of the topological nodal-line states and associated surface states for the first time, thus paving the way towards exploring the exotic properties of the topological nodal-line fermions in condensed matter systems.

          Abstract

          Nodal-line shaped bands appearing near the Fermi level host unique properties in topological matter, which has yet to be confirmed in real materials. Here, the authors report the existence of topological nodal-line states in the non-centrosymmetric single-crystalline spin-orbit semimetal PbTaSe 2.

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          Most cited references10

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          Generalized Gradient Approximation Made Simple.

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            Superconducting proximity effect and Majorana fermions at the surface of a topological insulator

            We study the proximity effect between an s-wave superconductor and the surface states of a strong topological insulator. The resulting two dimensional state resembles a spinless p_x+ip_y superconductor, but does not break time reversal symmetry. This state supports Majorana bound states at vortices. We show that linear junctions between superconductors mediated by the topological insulator form a non chiral 1 dimensional wire for Majorana fermions, and that circuits formed from these junctions provide a method for creating, manipulating and fusing Majorana bound states.
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              Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs

              We report discovery of a Weyl Fermion semimetal and Topological Fermi arcs in TaAs
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                Author and article information

                Journal
                Nat Commun
                Nat Commun
                Nature Communications
                Nature Publishing Group
                2041-1723
                02 February 2016
                2016
                : 7
                : 10556
                Affiliations
                [1 ]Department of Physics, Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University , Princeton, New Jersey 08544, USA
                [2 ]Department of Physics, National Tsing Hua University , Hsinchu 30013, Taiwan
                [3 ]Center for Condensed Matter Sciences, National Taiwan University , Taipei 10617, Taiwan
                [4 ]Princeton Center for Theoretical Science, Princeton University , Princeton, New Jersey 08544, USA
                [5 ]Department of Physics and Astronomy, University of British Columbia , Vancouver, British Columbia, Canada V6T 1Z1
                [6 ]Centre for Advanced 2D Materials and Graphene Research Centre National University of Singapore , 6 Science Drive 2, Singapore 117546, Singapore
                [7 ]Department of Physics, National University of Singapore , 2 Science Drive 3, Singapore 117542, Singapore
                [8 ]Department of Physics, Northeastern University , Boston, Massachusetts 02115, USA
                [9 ]Institute of Physics, Academia Sinica , Taipei 11529, Taiwan
                [10 ]ICQM, School of Physics, Peking University , Beijing 100871, China
                Author notes
                [*]

                These authors contributed equally to this work.

                Author information
                http://orcid.org/0000-0002-6495-874X
                http://orcid.org/0000-0003-0604-041X
                http://orcid.org/0000-0003-4273-9682
                http://orcid.org/0000-0003-1180-3127
                http://orcid.org/0000-0002-7221-5671
                http://orcid.org/0000-0003-1793-1461
                Article
                ncomms10556
                10.1038/ncomms10556
                4740879
                26829889
                2bbd6651-1db9-4b9e-b7dc-fe2569c43614
                Copyright © 2016, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.

                This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                History
                : 16 November 2015
                : 28 December 2015
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