Relativistic Quasi-particle Nature Emerging in semi-metallic Sr2IrO4.

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