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<p>Exceptional points (EPs), as degeneracy points in non-Hermitian systems, possess numerous unique physical properties and extensive applications. In this study, we propose a Fabry–Perot resonator with monolayer WSe<sub>2</sub> on a SiO<sub>2</sub>/Si substrate to realize multiple EPs. By exploiting the high refractive index of the two-dimensional (2D) material WSe<sub>2</sub>, three EPs with topological properties are observed at different incident angles. That is, when changing the light incident angles, a 2π topological phase surrounding the EP can be achieved at different wavelengths, exhibiting topologically protected properties. In addition, a refractive-index sensor is proposed on this basis, and an outstanding sensitivity comparable to that of existing surface plasmon sensors is observed. Therefore, this study applies 2D materials to achieve multiple EPs and provides a feasible approach for the development of non-Hermitian topological sensor devices.</p>

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The realization of multiple topological exceptional points in SiO2/Si covered by monolayer WSe2

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Fan Gao,
  • Tao Zhou,
  • Xingyu Wang,
  • Jinjie Zheng

摘要

Exceptional points (EPs), as degeneracy points in non-Hermitian systems, possess numerous unique physical properties and extensive applications. In this study, we propose a Fabry–Perot resonator with monolayer WSe2 on a SiO2/Si substrate to realize multiple EPs. By exploiting the high refractive index of the two-dimensional (2D) material WSe2, three EPs with topological properties are observed at different incident angles. That is, when changing the light incident angles, a 2π topological phase surrounding the EP can be achieved at different wavelengths, exhibiting topologically protected properties. In addition, a refractive-index sensor is proposed on this basis, and an outstanding sensitivity comparable to that of existing surface plasmon sensors is observed. Therefore, this study applies 2D materials to achieve multiple EPs and provides a feasible approach for the development of non-Hermitian topological sensor devices.