Distinct multiple fermionic states in a single topological metal.

ORAL

Abstract

Among the quantum materials that have recently gained interest are the topological insulators, wherein symmetry-protected surface states cross in reciprocal space, and the Dirac nodal-line semimetals, where bulk bands touch along a line in k-space. However, the existence of multiple fermion phases in a single material has not been verified yet. Using angle resolved photoemission spectroscopy (ARPES) and first principles electronic structure calculations, we systematically study the metallic material Hf2Te2P and discover properties, which are unique in a single topological quantum material. We experimentally observe weak topological insulator surface states and our calculations suggest additional strong topological insulator surface states. Our first-principles calculations reveal a one-dimensional Dirac crossing—the surface Dirac-node arc—along a high-symmetry direction which is confirmed by our ARPES measurements. This novel state originates from the surface bands of a weak topological insulator and is therefore distinct from the well-known Fermi arcs in semimetals.

*This work is supported by the Air Force Office of Scientific Research under Award No. FA9550-17-1-0415 and the startup fund from UCF (M.N).

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Presenters

  • Madhab Neupane

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

Authors

  • Madhab Neupane

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

  • Md Mofazzel Hosen

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

  • Klauss Dimitri

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

  • Ashis Kumar Nandy

    • Uppsala University

  • Alex Aperis

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

  • Raman Sankar

    • Center for Condensed Matter Sciences, National Taiwan University
    • Center for Condensed Matter Science, National Taiwan University
    • Center of Condensed Matter Sciences, National Taiwan University
    • Institute of Physics, Academia Sinica
    • National Taiwan University
    • Physics, Academia Sinica, Taiwan

  • Gyanendra Dhakal

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

  • Pablo Maldonado

    • Uppsala University

  • Firoza Kabir

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

  • Christopher Sims

    • University of Central Florida

  • Fangcheng Chou

    • Center for Condensed Matter Sciences, National Taiwan University
    • Center of Condensed Matter Sciences, National Taiwan University
    • National Taiwan University

  • Dariusz Kaczorowski

    • Polish Academy of Sciences
    • Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-950 Wroclaw, Poland
    • Institute of Low Temperature and Structure Research, Polish Academy of Sciences
    • Polish Academy of Science

  • Tomasz Durakiewicz

    • National Science Foundation
    • Los Alamos National Laboratory

  • Peter Oppeneer

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