标题： 从多孔石墨烯工程化二维凯库勒拓扑绝缘体 显示英文标题

标题： Engineering two-dimensional kagome topological insulator from porous graphene

摘要： 我们的研究提出了一种基于碳的二维（2D）凯莫结构拓扑绝缘体，不含任何金属原子，其费米能级与狄拉克点对齐，无需掺杂，克服了在基于二维金属有机框架（MOFs）的凯莫结构中观察到的重大瓶颈问题。 由在石墨烯片上创建图案化纳米孔形成的二维凯莫结构，命名为多孔石墨烯基凯莫晶格（PGKL），受到近期类似结构自下而上合成的启发。 由于我们多孔石墨烯缺乏镜像对称性，在紧束缚模型中仅考虑第一近邻本征自旋轨道耦合（ISOC），而非通常在石墨烯的Kane-Mele模型中使用的次近邻ISOC，PGKL表现出独特的能带结构，在平带中存在狄拉克带，使得费米能级附近可以实现拓扑态。 深入研究贝里曲率和陈数提供了对PGKL拓扑绝缘特性全面的理解，为二维拓扑绝缘体提供了有价值的见解。 对一维条带结构的分析强调了拓扑边缘态的出现。 显示英文摘要

摘要： Our study sets forth a carbon based two-dimensional (2D) kagome topological insulator without containing any metal atoms, that aligns the Fermi level with the Dirac point without the need for doping, overcoming a significant bottleneck issue observed in 2D metal-organic frameworks (MOFs)-based kagome structures. Our 2D kagome structure formed by creating patterned nano pores in the graphene sheet, nomenclatured as porous graphene-based kagome lattice (PGKL), is inspired by the recent bottom-up synthesis of similar structures. Because of absence of mirror symmetry in our porous graphene, by considering only first nearest neighbour intrinsic spin-orbit coupling (ISOC) within the tight-binding model unlike mostly used next nearest neighbour ISOC in the Kane-Mele model for graphene, PGKL exhibits distinctive band structures with Dirac bands amidst flat bands, allowing for the realization of topological states near the Fermi level. Delving into Berry curvature and Chern numbers provides a comprehensive understanding of the topological insulating properties of PGKL, offering valuable insights into 2D topological insulators. Analysis of the 1-D ribbon structure underscores the emergence of topological edge states.