Observation of Gapless Dirac Surface States in ZrGeTe

ORAL

Abstract

The experimental discovery of the topological Dirac semimetal provides a platform to search for novel exotic quantum phases in real materials. Recently, ZrSiS-type materials have been established as topological nodal-line semimetals where gapped Dirac-like surface states are observed. Here, we present an angle-resolved photoemission spectroscopy (ARPES) study of ZrGeTe, a non-symmorphic symmetry protected Dirac semimetal. We observe two Dirac-like gapless surface states at the same X point of the Brillouin zone. Our theoretical analysis and first-principles calculations reveal that these are protected by crystalline symmetry. Hence, ZrGeTe appears as a unique example of a naturally fine tuned system where the interplay between symmorphic and non-symmorphic symmetry leads to rich phenomenology, and thus opens opportunities to investigate the physics of Dirac semimetallic and topological insulating phases realized in a single material.

*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

  • Gyanendra Dhakal

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

Authors

  • Gyanendra Dhakal

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

  • Md Mofazzel Hosen

    • 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

  • Alex Aperis

    • Department of Physics and Astronomy, Uppsala University

  • Pablo Maldonado

    • Department of Physics and Astronomy, Uppsala University

  • Ilya Belopolski

    • Princeton Univ
    • Princeton University
    • Princeton U.

  • 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

  • Zahid Hasan

    • Princeton Univ
    • Princeton University
    • Princeton U.

  • 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

  • Peter Oppeneer

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

  • 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