激光工程化的三角铋烯中的$\Gamma$点拓扑
Laser-engineered $Γ$-point Topology in Trigonal Bismuthene
AI总结：
该研究预测了激光诱导三角铋烯中$\Gamma$点拓扑相变，实现高陈数量子反常霍尔态，为人工拓扑材料应用提供路线图。
摘要：
$\Gamma$点拓扑代表了拓扑绝缘体家族中的一个重要部分。在这里，我们对三角铋烯及其衍生物中光诱导的基于$\Gamma$点的拓扑操控进行了全面预测。我们的发现揭示了随着激光强度增加，拓扑相变（TPT）的两阶段过程。最初，量子自旋霍尔或金属态转变为量子反常霍尔（QAH）态（$C$ = $\pm$3），随后发生另一个TPT，产生补偿的陈绝缘态（$C$ = 0）。三角翘曲模型解释了这些态，描述了由$\pm$1阶复制带决定的$C_{3z}$旋转带反转过程。值得注意的是，这种高陈数QAH态在广泛的激光参数范围内持续存在，并且通过大的全局带隙（$\geq$ 60 meV）证明，其在室温以上仍保持功能。我们的工作为激光激发下的设计者$\Gamma$点拓扑提供了全面路线图，促进了人工拓扑材料的应用。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
