Coexistence of Weyl Points and Topological Nodal Lines in Ternary Transition Metal Telluride TaIrTe4

ORAL

Abstract

We report a combined theoretical and experimental study on TaIrTe4, a potential candidate of the minimal model of type-II Weyl semimetals. Unexpectedly, an intriguing node structure with twelve Weyl points and a pair of nodal lines protected by mirror symmetry was found by first-principle calculations, with its complex signatures such as the topologically non-trivial band crossings and topologically trivial Fermi arcs cross-validated by angle-resolved photoemission spectroscopy. Through external strain, the number of Weyl points can be reduced to the theoretical minimum of four, and the appearance of the nodal lines can be switched between different mirror planes in momentum space. The coexistence of tunable Weyl points and nodal lines establishes ternary transition-metal tellurides as a unique test ground for topological state characterization and engineering.

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Presenters

  • Xiaoqing Zhou

    Physics, Univ of Colorado - Boulder

Authors

  • Xiaoqing Zhou

    Physics, Univ of Colorado - Boulder

  • Qihang Liu

    Univ of Colorado - Boulder, Physics, Univ of Colorado - Boulder

  • QuanSheng Wu

    Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Physics, École Polytechnique Fédérale de Lausanne, C3MP, Institute of Physics, ÉCOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE (EPFL), ETH hoenggerberg

  • Tom Nummy

    Physics, Univ of Colorado - Boulder, Physics, University of Colorado - Boulder, University of Colorado

  • Haoxiang Li

    Physics, Univ of Colorado - Boulder, Physics, University of Colorado - Boulder, University of Colorado

  • Justin Griffith

    Physics, Univ of Colorado - Boulder

  • Stephen Parham

    Physics, Univ of Colorado - Boulder

  • Justin Waugh

    Physics, Univ of Colorado - Boulder

  • Eve Emmanouilidou

    Physics, University of California at Los Angeles, Department of Physics and Astronomy , Univ of California - Los Angeles, Physics and Astronomy, Univ of California - Los Angeles

  • Bing Shen

    Physics, University of California at Los Angeles, Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, Physics, University of California, Los Angeles, Physics and Astronomy, Univ of California - Los Angeles

  • Oleg Yazyev

    Chair of computational condensed matter physics, IPHYS, École Polytechnique Fédérale de Lausanne, Physics, École Polytechnique Fédérale de Lausanne, C3MP, Institute of Physics, ÉCOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE (EPFL), C3MP, IPHYS, École Polytechnique Fédérale de Lausanne, Ecole Polytechnique Federale de Lausanne

  • Ni Ni

    Physics, University of California at Los Angeles, Physics and Astronomy, Univ of California - Los Angeles, Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, Department of Physics and Astronomy , Univ of California - Los Angeles

  • Daniel Dessau

    Physics, Univ of Colorado - Boulder, Physics, University of Colorado - Boulder, University of Colorado