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.

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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