Laser-engineered $\Gamma$-point Topology in Trigonal Bismuthene
Abstract
The -point topology represents a significant segment in the family of topological insulators. Here we provide a comprehensive prediction of light-induced -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 ( = 3), followed by another TPT that yields a compensated Chern-insulating state ( = 0). The trigonal warping model accounts for these states, describing the -rotational band-inversion process, which is determined by 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 ( 60 meV). Our work provides a comprehensive roadmap towards the designer -point topology under laser excitation, facilitating applications of artificial topological materials.
Cite
@article{arxiv.2509.08068,
title = {Laser-engineered $\Gamma$-point Topology in Trigonal Bismuthene},
author = {Zhe Li and Haijun Cao and Sheng Meng},
journal= {arXiv preprint arXiv:2509.08068},
year = {2025}
}