Investigation of possible quantized circular photogalvanic effect in chiral multifold semimetals RhSi and CoSi

ORAL

Abstract

One of the most exciting phenomena from a single Weyl/multifold node in response to the electromagnetic wave is the quantized circular photogalvanic effect (CPGE), where a universal photo-current generation rate is expected regardless of the light frequency. By doing the terahertz emission measurement with widely tunable excitation energy from 0.2 to 1.1 eV, we exam two candidates for the quantized CPGE, RhSi and CoSi. We find both materials show giant but non-quantized CPGE. Combining the experimental results with density functional theory calculations, we explain the origins for the absence of the quantization and further propose to reach quantized CPGE in these two compounds by altering the Fermi level and increasing the hot-carrier lifetime. References: Ni, et al. arXiv. arXiv:2006.09612; Ni, et al. arXiv:2005.13473; Xu, et al. PNAS 10.1073/pnas.2010752117 (2020).

*This work is mainly supported by Army Research Office under the Grant W911NF1910342

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Presenters

  • Zhuoliang Ni

    • University of Pennsylvania
    • Department of Physics and Astronomy, University of Pennsylvania

Authors

  • Zhuoliang Ni

    • University of Pennsylvania
    • Department of Physics and Astronomy, University of Pennsylvania

  • Yang Zhang

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Kefeng Wang

    • University of Maryland, College Park
    • Brookhaven National Laboratory

  • Bing XU

    • University of Fribourg
    • Department of Physics and Fribourg Center for Nanomaterials,, University of Fribourg

  • Óscar Pozo Ocaña

    • Instituto de Ciencia de Materiales de Madrid

  • Xingyue Han

    • University of Pennsylvania
    • Department of Physics and Astronomy, University of Pennsylvania

  • Kaustuv Manna

    • Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solids,

  • Johnpierre Paglione

    • University of Maryland, College Park
    • Maryland Quantum Materials Center, Department of Physics, University of Maryland
    • Quantum Materials Center, Department of Physics, University of Maryland College Park
    • Quantum Materials Center, University of Maryland, College Park
    • Maryland Quantum Materials Center and Department of Physics, University of Maryland, College Park
    • University of Maryland

  • Claudia Felser

    • Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute for the Chemical Physics of Solids
    • Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute, Dresden, Germany
    • Max Planck, Dresden
    • Max Planck Institute for Chemical Physics of Solids, 01187 Dresden
    • Max Planck Institute for Chemical Physics of Solids,

  • Adolfo G Grushin

    • Institut Néel, CNRS and Université Grenoble Alpes
    • Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel
    • Institut Neel
    • CNRS Institut Néel
    • Institut Neel, CNRS and Universite Grenoble Alpes

  • Fernando De Juan

    • Donostia International Physics Center
    • Donostia International Physics Center and IKERBASQUE, Basque Foundation for Science

  • Eugene John Mele

    • Department of Physics and Astronomy, University of Pennsylvania
    • University of Pennsylvania

  • Liang Wu

    • University of Pennsylvania
    • Department of Physics and Astronomy, University of Pennsylvania