中国物理B ›› 2026, Vol. 35 ›› Issue (5): 57105-057105.doi: 10.1088/1674-1056/ae48c8

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Observation of exceptional points in anisotropic ReS2 microcavities

Huihua Chen(陈辉华)†, Yuquan Zhou(周玉全)†, Xin Li(李昕), Jinyang Lou(娄金阳), Song Luo(罗松), Hang Zhou(周航), Xinyue Zhang(张新悦), Zhao Xu(徐钊), Yan Liu(刘艳), Zheng Lv(吕峥), Yuxin Duan(段雨欣), Haodong Cheng(成浩东), Hongming Zhang(张鸿铭), Yaofeng Zhu(朱耀峰), Anpeng Li(李安鹏), Jian Ren(任坚), Xiao Wang(王潇), Lixin Zhang(章立心), Long Zhang(张龙)‡, and Zhanghai Chen(陈张海)§   

  1. Department of Physics, College of Physical Science and Technology, Xiamen University, Xiamen 361005, China
  • 收稿日期:2026-01-17 修回日期:2026-02-19 接受日期:2026-02-23 发布日期:2026-05-15
  • 通讯作者: Long Zhang, Zhanghai Chen E-mail:zhanglong@xmu.edu.cn;zhanghai@xmu.edu.cn
  • 基金资助:
    Project supported by the National Key R&D Program of China (Grant Nos. 2022YFA1206700, 2023YFA1407100, 2022YFA1204700, and 2023ZD0300300) and the National Natural Science Foundation of China (Grant Nos. W2541001, 12574079, 12304347, 12504373, 62175207, and 92250301).

Observation of exceptional points in anisotropic ReS2 microcavities

Huihua Chen(陈辉华)†, Yuquan Zhou(周玉全)†, Xin Li(李昕), Jinyang Lou(娄金阳), Song Luo(罗松), Hang Zhou(周航), Xinyue Zhang(张新悦), Zhao Xu(徐钊), Yan Liu(刘艳), Zheng Lv(吕峥), Yuxin Duan(段雨欣), Haodong Cheng(成浩东), Hongming Zhang(张鸿铭), Yaofeng Zhu(朱耀峰), Anpeng Li(李安鹏), Jian Ren(任坚), Xiao Wang(王潇), Lixin Zhang(章立心), Long Zhang(张龙)‡, and Zhanghai Chen(陈张海)§   

  1. Department of Physics, College of Physical Science and Technology, Xiamen University, Xiamen 361005, China
  • Received:2026-01-17 Revised:2026-02-19 Accepted:2026-02-23 Published:2026-05-15
  • Contact: Long Zhang, Zhanghai Chen E-mail:zhanglong@xmu.edu.cn;zhanghai@xmu.edu.cn
  • Supported by:
    Project supported by the National Key R&D Program of China (Grant Nos. 2022YFA1206700, 2023YFA1407100, 2022YFA1204700, and 2023ZD0300300) and the National Natural Science Foundation of China (Grant Nos. W2541001, 12574079, 12304347, 12504373, 62175207, and 92250301).

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摘要： Exceptional points (EPs) are spectral singularities in non-Hermitian systems where eigenvalues and eigenvectors simultaneously coalesce. Manipulating EPs in solid-state systems typically requires complex architectures. Here, based on a hybrid system consisted of few-layer rhenium disulfide (ReS$_{2}$) deposited on a distributed Bragg mirror, we demonstrate an all-optical method to dynamically control EPs by harnessing the intrinsic optical anisotropy of ReS$_{2}$. By utilizing the incident polarization angle as a dynamic control parameter, we continuously modulate the exciton-photon coupling strength, driving the system from the strong coupling regime to the weak coupling regime. The EPs are manifested as simultaneous coalescence of the real (energy) and imaginary (linewidth) parts of the complex eigenvalues. This dual-degeneracy provides unambiguous experimental evidence for EP formation and the associated collapse of the Hilbert space dimensionality. Our findings establish anisotropic light-matter coupled systems as a robust paradigm for exploring non-Hermitian topology in photonics, enabling polarization-driven topological devices without intricate nanofabrication.

关键词: exciton-polariton, non-Hermitian physics, exceptional points, optical anisotropy

Abstract: Exceptional points (EPs) are spectral singularities in non-Hermitian systems where eigenvalues and eigenvectors simultaneously coalesce. Manipulating EPs in solid-state systems typically requires complex architectures. Here, based on a hybrid system consisted of few-layer rhenium disulfide (ReS$_{2}$) deposited on a distributed Bragg mirror, we demonstrate an all-optical method to dynamically control EPs by harnessing the intrinsic optical anisotropy of ReS$_{2}$. By utilizing the incident polarization angle as a dynamic control parameter, we continuously modulate the exciton-photon coupling strength, driving the system from the strong coupling regime to the weak coupling regime. The EPs are manifested as simultaneous coalescence of the real (energy) and imaginary (linewidth) parts of the complex eigenvalues. This dual-degeneracy provides unambiguous experimental evidence for EP formation and the associated collapse of the Hilbert space dimensionality. Our findings establish anisotropic light-matter coupled systems as a robust paradigm for exploring non-Hermitian topology in photonics, enabling polarization-driven topological devices without intricate nanofabrication.

Key words: exciton-polariton, non-Hermitian physics, exceptional points, optical anisotropy

中图分类号:  (Polaritons (including photon-phonon and photon-magnon interactions))

  • 71.36.+c
03.65.Vf (Phases: geometric; dynamic or topological) 78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures) 42.25.Ja (Polarization)