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Optical Evidence of Chiral Plasmon mode in Dirac and Weyl semimetals

ORAL

Abstract

The first observation of chiral plasmon modes in 3D Dirac and Weyl materials Na3Bi and CoSi is reported through optical spectroscopy. Reflection measurements on single-crystals, over the spectral range from 20 mev to 2.5 eV and temperature ranging from 5K to 300K, show absorption features locked to the strongly temperature-dependent plasma edges. The frequency shifts of chiral plasmon features from the plasma edge are consistent with the Berry curvature associated with a Dirac or Weyl pair. The Lifshitz gap associated with inter-Fermi arcs transitions in CoSi is also reported.

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Presenters

  • Francois Joint

    University of Maryland, College Park

Authors

  • Francois Joint

    University of Maryland, College Park

  • Gregory S Jenkins

    University of Maryland, College Park

  • Chaowei Hu

    University of California, Los Angeles, Physics, University of California, Los Angeles, Physics and Astronomy Department, University of California, Los Angeles, Department of Physics and Astronomy, University of California, Los Angeles

  • Tiema Qian

    Department of Physics and Astronomy, University of California, Los Angeles

  • Ni Ni

    University of California, Los Angeles, Physics, University of California, Los Angeles, Physics and Astronomy Department, University of California, Los Angeles, Department of Physics and Astronomy, University of California, Los Angeles

  • Howard Drew

    University of Maryland, College Park