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<p>Two-dimensional van der Waals magnetic semiconductor CrSBr offers an ideal platform to achieve exciton-polaritons correlated with magnetic order for developing solid-state quantum, spintronic, and photonic devices. However, for the exciton-polaritons formed by lower-energy excitons (X<sub>L</sub> ≈ 1.37 eV), the coupling strength and nonlinear optical response are almost inert to the external magnetic field. Here, we demonstrate robust strong coupling between higher-energy excitons (X<sub>H</sub> ≈ 1.8 eV) and photons that persists up to room temperature, along with giant magnetic-field tunability. The Rabi splitting energy is tuned up to 100 meV within a moderate 0.45 T in-plane magnetic field due to changes in excitonic states during the spin transitions. Besides, we observe significantly enhanced polariton nonlinearity in the intermediate magnetic phase, which exhibits a distinct mode-number dependence and originates from magnon-assisted long-range attractive interactions and coupling strength reduction. These results advance the development of on-demand polariton platforms for spin-correlated quantum optoelectronics.</p>

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Drastically magnetically tuned coupling strength and nonlinearity in CrSBr exciton-polaritons

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月26日

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  • Chun Li,
  • Chao Shen,
  • Xuekai Ma,
  • Kwok Kwan Tang,
  • Yutong Zhang,
  • Nai Jiang,
  • Xinyi Deng,
  • Qing Wan,
  • Jiepeng Song,
  • Jiaqi Guo,
  • Tian Lan,
  • Hailong Fu,
  • Feng Li,
  • Yilin Wang,
  • Xinfeng Liu,
  • Qing Zhang

摘要

Two-dimensional van der Waals magnetic semiconductor CrSBr offers an ideal platform to achieve exciton-polaritons correlated with magnetic order for developing solid-state quantum, spintronic, and photonic devices. However, for the exciton-polaritons formed by lower-energy excitons (XL ≈ 1.37 eV), the coupling strength and nonlinear optical response are almost inert to the external magnetic field. Here, we demonstrate robust strong coupling between higher-energy excitons (XH ≈ 1.8 eV) and photons that persists up to room temperature, along with giant magnetic-field tunability. The Rabi splitting energy is tuned up to 100 meV within a moderate 0.45 T in-plane magnetic field due to changes in excitonic states during the spin transitions. Besides, we observe significantly enhanced polariton nonlinearity in the intermediate magnetic phase, which exhibits a distinct mode-number dependence and originates from magnon-assisted long-range attractive interactions and coupling strength reduction. These results advance the development of on-demand polariton platforms for spin-correlated quantum optoelectronics.