Dirac-like dispersion in nearly compensated Dirac semimetal ZrAs<sub>2</sub>

POSTER

Abstract

Recently, the transition metal dipnictide family with a monoclinic crystal structure is predicted as a potential candidate for supporting this compensated Dirac like electronic structure. Here we report an angle-resolved photoemission spectroscopy (ARPES) study of ZrAs2, a transition metal dipnictide with an orthorhombic crystal structure exhibiting large MR properties and nearly electron-hole compensation mechanisms. Our studies reveal multiple Fermi surface pockets such as the 6-fold petal-like Fermi pockets around the center (Γ point) and ellipsoidal shaped Fermi pockets at the corner (X point) of the Brillouin zone (BZ). Interestingly, Dirac like linearly dispersive states are observed at the zone corner of the BZ. Moreover, our magnetoresistance measurements and the occupied Fermi surface area calculations reveal the nearly compensated semimetallic characteristics of ZrAs2. Our findings suggest that type 12 system ZrAs2, with an orthorhombic crystal structure, is a new platform for unveiling interesting physics beyond Weyl semimetal and topological insulator systems.

*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).

Presenters

  • Firoza Kabir

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

Authors

  • Firoza Kabir

    • 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

  • 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

  • Tay-Rong Chang

    • Physics, National Cheng Kung University
    • National Cheng Kung University
    • Department of Physics, National Tsing Hua University
    • Natl Cheng Kung U.

  • Christopher Sims

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

  • Hsin Lin

    • Academia Sinica
    • National University of Singapore
    • Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
    • Institute of Physics, Academica Sinica
    • Institute of Physics, Academia Sinica
    • National U. of Singapore
    • Natl Univ of Singapore
    • National University of Signapore

  • 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

  • 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

  • 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