Topological Reality Switch: Towards Bulk-Boundary Selective Lasing
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arXiv
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866913923606773760 |
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| author | Ghorashi, Sayed Ali Akbar Sato, Masatoshi |
| author_facet | Ghorashi, Sayed Ali Akbar Sato, Masatoshi |
| contents | The emergence of complex spectra in non-Hermitian systems causes dramatic changes even under weak perturbations, significantly hindering their precise control for study and integration into practical applications. Achieving a controlled method to generate a real spectrum in non-Hermitian systems has long been a key objective in the field. In this study, we explore the 2D non-Hermitian Su-Schrieffer-Heeger (SSH) model and introduce a reality switch that allows for the controllable induction of a real spectrum depending on the imposed boundary condition. We show that a topological phase transition in the complex gap accompanies the switching process. Our work lays the cornerstone for developing a selective bulk-boundary control mechanism for the gain and lasing behaviors in non-Hermitian systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_02038 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Topological Reality Switch: Towards Bulk-Boundary Selective Lasing Ghorashi, Sayed Ali Akbar Sato, Masatoshi Quantum Physics Mesoscale and Nanoscale Physics Other Condensed Matter Optics The emergence of complex spectra in non-Hermitian systems causes dramatic changes even under weak perturbations, significantly hindering their precise control for study and integration into practical applications. Achieving a controlled method to generate a real spectrum in non-Hermitian systems has long been a key objective in the field. In this study, we explore the 2D non-Hermitian Su-Schrieffer-Heeger (SSH) model and introduce a reality switch that allows for the controllable induction of a real spectrum depending on the imposed boundary condition. We show that a topological phase transition in the complex gap accompanies the switching process. Our work lays the cornerstone for developing a selective bulk-boundary control mechanism for the gain and lasing behaviors in non-Hermitian systems. |
| title | Topological Reality Switch: Towards Bulk-Boundary Selective Lasing |
| topic | Quantum Physics Mesoscale and Nanoscale Physics Other Condensed Matter Optics |
| url | https://arxiv.org/abs/2507.02038 |