Dynamically stable topological edge states in an extended Su-Schrieffer-Heeger ladder with balanced perturbation
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916781747077120 |
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| author | Ma, E. S. Zhang, K. L. Song, Z. |
| author_facet | Ma, E. S. Zhang, K. L. Song, Z. |
| contents | The on-site potentials may break the symmetry of a system, resulting in the loss of its original topology protected by the symmetry. In this work, we study the counteracting effect of non-Hermitian terms on real potentials, resulting in dynamically stable topological edge states. We show exactly for a class of systems that the spectrum remains unchanged in the presence of balanced perturbations. As a demonstration, we investigate an extended non-Hermitian Su-Schrieffer-Heeger(SSH) ladder. We find that the bulk-boundary correspondence still holds, and the zero-energy edge states become coalescing states. In comparison to the original SSH chain, such edge states are robust not only against local perturbations but also in the time domain. As a result, a trivial initial state can always evolve to a stable edge state. Our results provide insights for the application of time-domain stable topological quantum devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_05666 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dynamically stable topological edge states in an extended Su-Schrieffer-Heeger ladder with balanced perturbation Ma, E. S. Zhang, K. L. Song, Z. Strongly Correlated Electrons The on-site potentials may break the symmetry of a system, resulting in the loss of its original topology protected by the symmetry. In this work, we study the counteracting effect of non-Hermitian terms on real potentials, resulting in dynamically stable topological edge states. We show exactly for a class of systems that the spectrum remains unchanged in the presence of balanced perturbations. As a demonstration, we investigate an extended non-Hermitian Su-Schrieffer-Heeger(SSH) ladder. We find that the bulk-boundary correspondence still holds, and the zero-energy edge states become coalescing states. In comparison to the original SSH chain, such edge states are robust not only against local perturbations but also in the time domain. As a result, a trivial initial state can always evolve to a stable edge state. Our results provide insights for the application of time-domain stable topological quantum devices. |
| title | Dynamically stable topological edge states in an extended Su-Schrieffer-Heeger ladder with balanced perturbation |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2506.05666 |