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Nonlinear optical diode effect in a magnetic Weyl semimetal

Author

Listed:
  • Christian Tzschaschel

    (Harvard University
    Max-Born Institute for Nonlinear Optics and Short Pulse Spectroscopy)

  • Jian-Xiang Qiu

    (Harvard University)

  • Xue-Jian Gao

    (Hong Kong University of Science and Technology)

  • Hou-Chen Li

    (Harvard University)

  • Chunyu Guo

    (Max Planck Institute for the Structure and Dynamics of Matter
    École Polytechnique Fédérale de Lausanne (EPFL))

  • Hung-Yu Yang

    (Boston College)

  • Cheng-Ping Zhang

    (Hong Kong University of Science and Technology)

  • Ying-Ming Xie

    (Hong Kong University of Science and Technology)

  • Yu-Fei Liu

    (Harvard University)

  • Anyuan Gao

    (Harvard University)

  • Damien Bérubé

    (Harvard University)

  • Thao Dinh

    (Harvard University)

  • Sheng-Chin Ho

    (Harvard University)

  • Yuqiang Fang

    (Chinese Academy of Science
    College of Chemistry and Molecular Engineering Peking University)

  • Fuqiang Huang

    (Chinese Academy of Science
    College of Chemistry and Molecular Engineering Peking University)

  • Johanna Nordlander

    (Harvard University)

  • Qiong Ma

    (Boston College
    CIFAR)

  • Fazel Tafti

    (Boston College)

  • Philip J. W. Moll

    (Max Planck Institute for the Structure and Dynamics of Matter
    École Polytechnique Fédérale de Lausanne (EPFL))

  • Kam Tuen Law

    (Hong Kong University of Science and Technology)

  • Su-Yang Xu

    (Harvard University)

Abstract

Diode effects are of great interest for both fundamental physics and modern technologies. Electrical diode effects (nonreciprocal transport) have been observed in Weyl systems. Optical diode effects arising from the Weyl fermions have been theoretically considered but not probed experimentally. Here, we report the observation of a nonlinear optical diode effect (NODE) in the magnetic Weyl semimetal CeAlSi, where the magnetization introduces a pronounced directionality in the nonlinear optical second-harmonic generation (SHG). We demonstrate a six-fold change of the measured SHG intensity between opposite propagation directions over a bandwidth exceeding 250 meV. Supported by density-functional theory, we establish the linearly dispersive bands emerging from Weyl nodes as the origin of this broadband effect. We further demonstrate current-induced magnetization switching and thus electrical control of the NODE. Our results advance ongoing research to identify novel nonlinear optical/transport phenomena in magnetic topological materials and further opens new pathways for the unidirectional manipulation of light.

Suggested Citation

  • Christian Tzschaschel & Jian-Xiang Qiu & Xue-Jian Gao & Hou-Chen Li & Chunyu Guo & Hung-Yu Yang & Cheng-Ping Zhang & Ying-Ming Xie & Yu-Fei Liu & Anyuan Gao & Damien Bérubé & Thao Dinh & Sheng-Chin Ho, 2024. "Nonlinear optical diode effect in a magnetic Weyl semimetal," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47291-8
    DOI: 10.1038/s41467-024-47291-8
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    References listed on IDEAS

    as
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