Observation of non-Hermitian boundary induced hybrid skin-topological effect excited by synthetic complex frequencies
Abstract The hybrid skin-topological effect (HSTE) has recently been proposed as a mechanism where topological edge states collapse into corner states under the influence of the non-Hermitian skin effect (NHSE). However, directly observing this effect is challenging due to the complex frequencies of...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-12-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-024-55218-6 |
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| author | Tianshu Jiang Chenyu Zhang Ruo-Yang Zhang Yingjuan Yu Zhenfu Guan Zeyong Wei Zhanshan Wang Xinbin Cheng C. T. Chan |
| author_facet | Tianshu Jiang Chenyu Zhang Ruo-Yang Zhang Yingjuan Yu Zhenfu Guan Zeyong Wei Zhanshan Wang Xinbin Cheng C. T. Chan |
| author_sort | Tianshu Jiang |
| collection | DOAJ |
| description | Abstract The hybrid skin-topological effect (HSTE) has recently been proposed as a mechanism where topological edge states collapse into corner states under the influence of the non-Hermitian skin effect (NHSE). However, directly observing this effect is challenging due to the complex frequencies of eigenmodes. In this study, we experimentally observe HSTE corner states using synthetic complex frequency excitations in a transmission line network. We demonstrate that HSTE induces asymmetric transmission along a specific direction within the topological band gap. Besides HSTE, we identify corner states originating from non-chiral edge states, which are caused by the unbalanced effective onsite energy shifts at the boundaries of the network. Furthermore, our results suggest that whether the bulk interior is Hermitian or non-Hermitian is not a key factor for HSTE. Instead, the HSTE states can be realized and relocated simply by adjusting the non-Hermitian distribution at the boundaries. Our research has deepened the understanding of a range of issues regarding HSTE, paving the way for advancements in the design of non-Hermitian topological devices. |
| format | Article |
| id | doaj-art-b5e80b42474c41af88cb3422d0344617 |
| institution | Kabale University |
| issn | 2041-1723 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-b5e80b42474c41af88cb3422d03446172025-01-05T12:35:43ZengNature PortfolioNature Communications2041-17232024-12-0115111210.1038/s41467-024-55218-6Observation of non-Hermitian boundary induced hybrid skin-topological effect excited by synthetic complex frequenciesTianshu Jiang0Chenyu Zhang1Ruo-Yang Zhang2Yingjuan Yu3Zhenfu Guan4Zeyong Wei5Zhanshan Wang6Xinbin Cheng7C. T. Chan8MOE Key Laboratory of Advanced Micro-Structured Materials, Shanghai Frontiers Science Center of Digital Optics, Institute of Precision Optical Engineering, and School of Physics Science and Engineering, Tongji UniversityMOE Key Laboratory of Advanced Micro-Structured Materials, Shanghai Frontiers Science Center of Digital Optics, Institute of Precision Optical Engineering, and School of Physics Science and Engineering, Tongji UniversityDepartment of Physics, The Hong Kong University of Science and TechnologyMOE Key Laboratory of Advanced Micro-Structured Materials, Shanghai Frontiers Science Center of Digital Optics, Institute of Precision Optical Engineering, and School of Physics Science and Engineering, Tongji UniversityMOE Key Laboratory of Advanced Micro-Structured Materials, Shanghai Frontiers Science Center of Digital Optics, Institute of Precision Optical Engineering, and School of Physics Science and Engineering, Tongji UniversityMOE Key Laboratory of Advanced Micro-Structured Materials, Shanghai Frontiers Science Center of Digital Optics, Institute of Precision Optical Engineering, and School of Physics Science and Engineering, Tongji UniversityMOE Key Laboratory of Advanced Micro-Structured Materials, Shanghai Frontiers Science Center of Digital Optics, Institute of Precision Optical Engineering, and School of Physics Science and Engineering, Tongji UniversityMOE Key Laboratory of Advanced Micro-Structured Materials, Shanghai Frontiers Science Center of Digital Optics, Institute of Precision Optical Engineering, and School of Physics Science and Engineering, Tongji UniversityDepartment of Physics, The Hong Kong University of Science and TechnologyAbstract The hybrid skin-topological effect (HSTE) has recently been proposed as a mechanism where topological edge states collapse into corner states under the influence of the non-Hermitian skin effect (NHSE). However, directly observing this effect is challenging due to the complex frequencies of eigenmodes. In this study, we experimentally observe HSTE corner states using synthetic complex frequency excitations in a transmission line network. We demonstrate that HSTE induces asymmetric transmission along a specific direction within the topological band gap. Besides HSTE, we identify corner states originating from non-chiral edge states, which are caused by the unbalanced effective onsite energy shifts at the boundaries of the network. Furthermore, our results suggest that whether the bulk interior is Hermitian or non-Hermitian is not a key factor for HSTE. Instead, the HSTE states can be realized and relocated simply by adjusting the non-Hermitian distribution at the boundaries. Our research has deepened the understanding of a range of issues regarding HSTE, paving the way for advancements in the design of non-Hermitian topological devices.https://doi.org/10.1038/s41467-024-55218-6 |
| spellingShingle | Tianshu Jiang Chenyu Zhang Ruo-Yang Zhang Yingjuan Yu Zhenfu Guan Zeyong Wei Zhanshan Wang Xinbin Cheng C. T. Chan Observation of non-Hermitian boundary induced hybrid skin-topological effect excited by synthetic complex frequencies Nature Communications |
| title | Observation of non-Hermitian boundary induced hybrid skin-topological effect excited by synthetic complex frequencies |
| title_full | Observation of non-Hermitian boundary induced hybrid skin-topological effect excited by synthetic complex frequencies |
| title_fullStr | Observation of non-Hermitian boundary induced hybrid skin-topological effect excited by synthetic complex frequencies |
| title_full_unstemmed | Observation of non-Hermitian boundary induced hybrid skin-topological effect excited by synthetic complex frequencies |
| title_short | Observation of non-Hermitian boundary induced hybrid skin-topological effect excited by synthetic complex frequencies |
| title_sort | observation of non hermitian boundary induced hybrid skin topological effect excited by synthetic complex frequencies |
| url | https://doi.org/10.1038/s41467-024-55218-6 |
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