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Terahertz photon to dc current conversion via magnetic excitations of multiferroics

Author

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  • Makiko Ogino

    (University of Tokyo)

  • Yoshihiro Okamura

    (University of Tokyo)

  • Kosuke Fujiwara

    (University of Tokyo)

  • Takahiro Morimoto

    (University of Tokyo)

  • Naoto Nagaosa

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Yoshio Kaneko

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Yoshinori Tokura

    (University of Tokyo
    RIKEN Center for Emergent Matter Science (CEMS)
    University of Tokyo)

  • Youtarou Takahashi

    (University of Tokyo
    RIKEN Center for Emergent Matter Science (CEMS))

Abstract

Direct conversion from terahertz photon to charge current is a key phenomenon for terahertz photonics. Quantum geometrical description of optical processes in crystalline solids predicts existence of field-unbiased dc photocurrent arising from terahertz-light generation of magnetic excitations in multiferroics, potentially leading to fast and energy-efficient terahertz devices. Here, we demonstrate the dc charge current generation from terahertz magnetic excitations in multiferroic perovskite manganites with spin-driven ferroelectricity, while keeping an insulating state with no free carrier. It is also revealed that electromagnon, which ranges sub-terahertz to 2 THz, as well as antiferromagnetic resonance shows the giant conversion efficiency. Polar asymmetry induced by the cycloidal spin order gives rise to this terahertz-photon-induced dc photocurrent, and no external magnetic and electric bias field are required for this conversion process. The observed phenomena are beyond the conventional photovoltaics in semi-classical regime and demonstrate the essential role of quantum geometrical aspect in low-energy optical processes. Our finding establishes a paradigm of terahertz photovoltaic phenomena, paving a way for terahertz photonic devices and energy harvesting.

Suggested Citation

  • Makiko Ogino & Yoshihiro Okamura & Kosuke Fujiwara & Takahiro Morimoto & Naoto Nagaosa & Yoshio Kaneko & Yoshinori Tokura & Youtarou Takahashi, 2024. "Terahertz photon to dc current conversion via magnetic excitations of multiferroics," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-49056-9
    DOI: 10.1038/s41467-024-49056-9
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    References listed on IDEAS

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