Optical Evidence of Chiral Magnetic Anomaly in Weyl Semimetal TaAs

ORAL

Abstract

Chiral pumping from optical electric fields oscillating at THz frequencies is observed in the Weyl material TaAs with electric and magnetic fields aligned along both the a- and c-axes. Free carrier spectral weight enhancement is measured directly for the first time, confirming theoretical expectations of chiral pumping. A departure from linear field-dependence of the Drude weight is observed at the highest fields in the quantum limit, providing direct evidence of field-dependent Fermi velocity of the chiral Landau level. Implications for the chiral magnetic effect in Weyl semimetals from the optical f-sum rule are discussed

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Presenters

  • Antonio Levy

    Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland

Authors

  • Antonio Levy

    Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland

  • Andrei B Sushkov

    Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland

  • Fengguang Liu

    Anhui Agricultural University

  • Bing Shen

    Department of Physics and Astronomy, University of California, Los Angeles, University of California, Los Angeles, Physics and Astronomy, university of california los angeles

  • Ni Ni

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

  • Howard Drew

    Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland

  • Gregory S Jenkins

    Laboratory for Physical Sciences