Relativistic Quasi-particle Nature Emerging in semi-metallic Sr<sub>2</sub>IrO<sub>4</sub>.

ORAL

Abstract

Whereas Dirac carrier responses have been extensively investigated in weakly-correlated-systems, it is rare to observe the Dirac physics in strongly-correlated-materials. Here, we provide experimental and theoretical evidences of an emergence of a Dirac dispersion in Tb-doped Sr2IrO4 which exhibits a semi-metallic and paramagnetic ground state. From the symmetry analyses, we find that the multiple crystal symmetries including nonsymmorphic symmetry play a pivotal role in the development of the Dirac dispersion, and furthermore, an intrinsic d-wave gap order collapse the line-nodal Dirac dispersion into the point-nodal dispersion. Linear dispersion of the energy band near the Fermi level is confirmed by angle-resolved photoemission spectroscopy, and the Dirac carrier responses are further manifested by an extremely low-scattering rate (~6 cm-1) of free carriers.

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Presenters

  • Jeong Woo Han

    • Department of Physics and Photon Science, Gwangju Institute of Science and Technology
    • Physics and photon science, GIST

Authors

  • Jeong Woo Han

    • Department of Physics and Photon Science, Gwangju Institute of Science and Technology
    • Physics and photon science, GIST

  • Sun Woo Kim

    • Physics, Hanyang University

  • Wonshik Kyung

    • Lawrence Berkeley National Laboratory

  • Changyoung Kim

    • Department of Physics and Astronomy, Seoul National University (SNU)
    • Physics and astronomy, Seoul National University
    • Seoul National University
    • CCES-IBS
    • Institute for Basic Science
    • IBS-CCES, Seoul National University

  • Gang Cao

    • Department of Physics, University of Colorado-Boulder
    • Department of Physics, University of Colorado, Boulder CO 80309
    • Department of Physics, University of Colorado, Boulder, CO 80309
    • Department of Physics, University of Colorado at Boulder
    • Physics and Astronomy, University of Kentucky
    • University of Colorado, Boulder
    • University of Colorado Boulder

  • Jinchen Wang

    • Physics, Renmin University of China

  • Sangmo Cheon

    • Physics, Hanyang University

  • Jongseok Lee

    • Gwangju Institute of Science and Technology
    • Department of Physcis and Photon Science, Gwangju Institute of Science and Technology, Korea
    • Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju, South Korea
    • Department of Physics and Photon science, Gwangju Institute of Science and Technology
    • Department of Physics and Photon Science, Gwangju Institute of Science and Technology
    • Physics and photon science, GIST