Third-order exceptional line in a nitrogen-vacancy spin system
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arXiv
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| Format: | Preprint |
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2024
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| author | Wu, Yang Wang, Yunhan Ye, Xiangyu Liu, Wenquan Niu, Zhibo Duan, Chang-Kui Wang, Ya Rong, Xing Du, Jiangfeng |
| author_facet | Wu, Yang Wang, Yunhan Ye, Xiangyu Liu, Wenquan Niu, Zhibo Duan, Chang-Kui Wang, Ya Rong, Xing Du, Jiangfeng |
| contents | The exceptional points (EPs) aroused from the non-Hermiticity bring rich phenomena, such as exceptional nodal topologies, unidirectional invisibility, single-mode lasing, sensitivity enhancement and energy harvesting. Isolated high-order EPs have been observed to exhibit richer topological characteristics and better performance in sensing over 2nd-order EPs. Recently, high-order EP geometries, such as lines or rings formed entirely by high order EPs, are predicted to provide richer phenomena and advantages over stand-alone high-order EPs. However, experimental exploration of high-order EP geometries is hitherto beyond reach due to the demand of more degrees of freedom in the Hamiltonian's parameter space or a higher level of symmetries. Here we report the observation of the third-order exceptional line (EL) at the atomic scale. By introducing multiple symmetries, the emergence of the third-order EL has been successfully realized with a single electron spin of nitrogen-vacancy center in diamond. Furthermore, the behaviors of the EP structure under different symmetries are systematically investigated. The symmetries are shown to play essential roles in the occurrence of high-order EPs and the related EP geometries. Our work opens a new avenue to explore high-order EP-related topological physics at the atomic scale and to the potential applications of high-order EPs in quantum technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_09690 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Third-order exceptional line in a nitrogen-vacancy spin system Wu, Yang Wang, Yunhan Ye, Xiangyu Liu, Wenquan Niu, Zhibo Duan, Chang-Kui Wang, Ya Rong, Xing Du, Jiangfeng Quantum Physics The exceptional points (EPs) aroused from the non-Hermiticity bring rich phenomena, such as exceptional nodal topologies, unidirectional invisibility, single-mode lasing, sensitivity enhancement and energy harvesting. Isolated high-order EPs have been observed to exhibit richer topological characteristics and better performance in sensing over 2nd-order EPs. Recently, high-order EP geometries, such as lines or rings formed entirely by high order EPs, are predicted to provide richer phenomena and advantages over stand-alone high-order EPs. However, experimental exploration of high-order EP geometries is hitherto beyond reach due to the demand of more degrees of freedom in the Hamiltonian's parameter space or a higher level of symmetries. Here we report the observation of the third-order exceptional line (EL) at the atomic scale. By introducing multiple symmetries, the emergence of the third-order EL has been successfully realized with a single electron spin of nitrogen-vacancy center in diamond. Furthermore, the behaviors of the EP structure under different symmetries are systematically investigated. The symmetries are shown to play essential roles in the occurrence of high-order EPs and the related EP geometries. Our work opens a new avenue to explore high-order EP-related topological physics at the atomic scale and to the potential applications of high-order EPs in quantum technologies. |
| title | Third-order exceptional line in a nitrogen-vacancy spin system |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2401.09690 |