Time reversal and lattice symmetry breaking in Nd2Ir2O7 observed by Raman scattering.

ORAL

Abstract

Abstract body: Nd2Ir2O7 is a semimetal compound, in which a competition between spin-orbit coupling and electronic correlations may lead to exotic physics. In particular, a Weyl semimetal state was suggested for this material. Using polarized Raman scattering to study this material, we can distinguish between magnetic excitations and transitions over the electronic gap in the insulating regime below 30 K. We follow the evolution of these features on. This allows us to identify two temperature regimes, between 30 and approximately 15 K where we observe an electronic gap and developing of magnetic order related to iridium spins, and the lower temperature regime where we observe evidence of broken symmetry of the lattice.

*This work was supported as part of the Institute for Quantum Matter, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. DE-SC0019331.

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Presenters

  • Natalia Drichko

    • Johns Hopkins University
    • Department of Physics and Astronomy, Johns Hopkins University

Authors

  • Yuanyuan Xu

    • Johns Hopkins University
    • Department of Physics and Astronomy, Johns Hopkins University

  • Jeremie Teyssier

    • Department of Quantum Matter Physics, University of Geneva

  • Takumi Ohtsuki

    • University of Tokyo, Institute for Solid State Physics

  • Satoru Nakatsuji

    • University of Tokyo, Institute for Solid State Physics
    • University of Tokyo

  • Dirk Van Der Marel

    • Department of Quantum Matter Physics, University of Geneva

  • Natalia Drichko

    • Johns Hopkins University
    • Department of Physics and Astronomy, Johns Hopkins University