Discovery of topological nodal-line fermionic phase in a magnetic material GdSbTe

ORAL

Abstract

Topological Dirac semimetals with accidental band touching between conduction and valence bands protected by time reversal and inversion symmetry are at the frontier of modern condensed matter research. Most of the discovered topological semimetals are nonmagnetic and conserve time-reversal symmetry. Here we report the experimental discovery of an antiferromagnetic topological nodal-line semimetallic state in GdSbTe using angle-resolved photoemission spectroscopy. Our systematic study reveals the detailed electronic structure of the paramagnetic state of antiferromagnetic GdSbTe. We observe the nodal-line state along the Γ-M direction of the Brillouin zone (BZ). Interestingly, our experimental data show a robust Dirac like state at the X point of the BZ both below and above the magnetic transition temperature (TN = 13 K). Having a relatively high transition temperature, GdSbTe provides an archetypical platform to study the interaction between magnetism and topological states of matter.

*This work was supported by the Air Force Office of Scientific Research under Award Number FA9550-17-1-0415 and the startup fund from UCF (MN).

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Presenters

  • Md Mofazzel Hosen

    • Department of Physics, University of Central Florida
    • University of central florida
    • Department of Physics, Univ of Central Florida

Authors

  • Md Mofazzel Hosen

    • Department of Physics, University of Central Florida
    • University of central florida
    • Department of Physics, Univ of Central Florida

  • Gyanendra Dhakal

    • Department of Physics, University of Central Florida
    • University of central florida
    • Department of Physics, Univ of Central Florida

  • Klauss Dimitri

    • Department of Physics, University of Central Florida
    • University of central florida
    • Department of Physics, Univ of Central Florida

  • Pablo Maldonado

    • Department of Physics and Astronomy, Uppsala University

  • Alex Aperis

    • Department of Physics and Astronomy, Uppsala University

  • Firoza Kabir

    • Department of Physics, University of Central Florida
    • University of central florida
    • Department of Physics, Univ of Central Florida

  • Christopher Sims

    • University of central florida
    • Department of Physics, University of Central Florida

  • Peter Riseborough

    • Temple Univ
    • Physics, Temple Univ
    • Department of Physics, Temple University

  • Peter Oppeneer

    • Department of Physics and Astronomy, Uppsala University
    • Uppsala University

  • Dariusz Kaczorowski

    • Institute of Low Temperature and Structure Research, Polish Academy of Sciences
    • Institute of Low Temperature and Structure Research, Polish Academy of Science
    • Institute of Low Temperature and Structure Research

  • Tomasz Durakiewicz

    • Condensed Matter and Magnet Science Group, Los Alamos National Laboratory
    • Los Alamos National Laboratory
    • Condensed Matter and Magnet Science Group,, Los Alamos National Laboratory

  • Madhab Neupane

    • Department of Physics, University of Central Florida
    • University of central florida
    • Department of Physics, Univ of Central Florida
    • Univ of Central Florida
    • University of Central Florida
    • Department of Physics , Univ of Central Florida