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arXiv · 2411.11555

Strongly Magnetically Tuned Coupling Strength and Nonlinearity in CrSBr Exciton-Polaritons

Chun Li·Chao Shen·Xuekai Ma·Kwok Kwan Tang·Nai Jiang·Xinyi Deng·Qing Wan·Jiepeng Song·Jiaqi Guo·Tian Lan·Feng Li·Yilin Wang·Xinfeng Liu·Qing Zhang
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Abstract

Two-dimensional van der Waals (vdW) magnetic semiconductors CrSBr offer an ideal platform to achieve exciton-polaritons correlated with magnetic orders 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.

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Chun Li, Chao Shen, Xuekai Ma, Kwok Kwan Tang, Nai Jiang, Xinyi Deng, Qing Wan, Jiepeng Song, Jiaqi Guo, Tian Lan, Feng Li, Yilin Wang, Xinfeng Liu, Qing Zhang. 2024-11-18. Strongly Magnetically Tuned Coupling Strength and Nonlinearity in CrSBr Exciton-Polaritons. https://doi.org/10.1038/s41377-026-02371-w

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