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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.08068 |
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| _version_ | 1866914032476225536 |
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| author | Li, Zhe Cao, Haijun Meng, Sheng |
| author_facet | Li, Zhe Cao, Haijun Meng, Sheng |
| contents | The $Γ$-point topology represents a significant segment in the family of topological insulators. Here we provide a comprehensive prediction of light-induced $Γ$-point-based topological manipulation in trigonal bismuthene and its derivatives. Our findings unveil a two-stage process of topological phase transitions (TPT) as the laser intensity increases. Initially, a quantum-spin-Hall or metallic state transitions to a quantum-anomalous-Hall (QAH) state ($C$ = $\pm$3), followed by another TPT that yields a compensated Chern-insulating state ($C$ = 0). The trigonal warping model accounts for these states, describing the $C_{3z}$-rotational band-inversion process, which is determined by $\pm$1 orders of replica bands. Notably, this high Chern-number QAH state persists over a broad range of laser parameters, maintaining functionality beyond room temperature as evidenced by the large global gaps ($\geq$ 60 meV). Our work provides a comprehensive roadmap towards the designer $Γ$-point topology under laser excitation, facilitating applications of artificial topological materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_08068 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Laser-engineered $Γ$-point Topology in Trigonal Bismuthene Li, Zhe Cao, Haijun Meng, Sheng Mesoscale and Nanoscale Physics Materials Science The $Γ$-point topology represents a significant segment in the family of topological insulators. Here we provide a comprehensive prediction of light-induced $Γ$-point-based topological manipulation in trigonal bismuthene and its derivatives. Our findings unveil a two-stage process of topological phase transitions (TPT) as the laser intensity increases. Initially, a quantum-spin-Hall or metallic state transitions to a quantum-anomalous-Hall (QAH) state ($C$ = $\pm$3), followed by another TPT that yields a compensated Chern-insulating state ($C$ = 0). The trigonal warping model accounts for these states, describing the $C_{3z}$-rotational band-inversion process, which is determined by $\pm$1 orders of replica bands. Notably, this high Chern-number QAH state persists over a broad range of laser parameters, maintaining functionality beyond room temperature as evidenced by the large global gaps ($\geq$ 60 meV). Our work provides a comprehensive roadmap towards the designer $Γ$-point topology under laser excitation, facilitating applications of artificial topological materials. |
| title | Laser-engineered $Γ$-point Topology in Trigonal Bismuthene |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2509.08068 |