文献类型：期刊文献

中文题名：From Topological Nodal-Line Semimetals to Quantum Spin Hall Insulators in Tetragonal SnX Monolayers(X=F,Cl,Br,I)

英文题名：From Topological Nodal-Line Semimetals to Quantum Spin Hall Insulators in Tetragonal SnX Monolayers (X=F, Cl, Br, I)

作者：Zhu, Ye[1,2];Zhao, Bao[3];Xue, Yang[4];Xu, Wei[1,2];Xu, Wenting[1,2];Yang, Zhongqin[1,2,5]

机构：[1]Fudan Univ, State Key Lab Surface Phys, Key Lab Computat Phys Sci MOE, Shanghai 200433, Peoples R China;[2]Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China;[3]Liaocheng Univ, Sch Phys Sci & Informat Technol, Shandong Key Lab Opt Commun Sci & Technol, Liaocheng 252059, Peoples R China;[4]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[5]Shanghai Qi Zhi Inst, Shanghai 200030, Peoples R China

年份：2024

卷号：41

期号：6

中文期刊名：Chinese Physics Letters

外文期刊名：CHINESE PHYSICS LETTERS

收录：CSTPCD;;EI(收录号：20243216820482);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:001282696500001)】；CSCD:【CSCD2023_2024】；

基金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 12174059, 11874117, 11904101, and 11604134), and the Natural Science Foundation of Shanghai (Grant No. 21ZR140820).

语种：英文

中文关键词：topological;metals;quantum;

外文关键词：Tin - Tin compounds - Topology

摘要：Two-dimensional(2D)topological materials have recently garnered significant interest due to their profound physical properties and promising applications for future quantum nanoelectronics.Achieving various topological states within one type of materials is,however,seldom reported.Based on first-principles calculations and tightbinding models,we investigate topological electronic states in a novel family of 2D halogenated tetragonal stanene(T-SnX,X=F,Cl,Br,I).All the four monolayers are found to be unusual topological nodal-line semimetals(NLSs),protected by a glide mirror symmetry.When spin-orbit coupling(SOC)is turned on,T-SnF and TSnCl are still ascertained as topological NLSs due to the remaining band inversion,primarily composed of Sn pxy orbitals,while T-Sn Br and T-SnI become quantum spin Hall insulators.The phase transition is ascribed to moving up in energy of Sn s orbitals and increasing of SOC strengths.The topology origin in the materials is uniformly rationalized through elementary band representations.The robust and diverse topological states found in the 2D T-SnX monolayers position them as an excellent material platform for development of innovative topological electronics.
Two-dimensional (2D) topological materials have recently garnered significant interest due to their profound physical properties and promising applications for future quantum nanoelectronics. Achieving various topological states within one type of materials is, however, seldom reported. Based on first-principles calculations and tight-binding models, we investigate topological electronic states in a novel family of 2D halogenated tetragonal stanene (T-SnX, X = F, Cl, Br, I). All the four monolayers are found to be unusual topological nodal-line semimetals (NLSs), protected by a glide mirror symmetry. When spin-orbit coupling (SOC) is turned on, T-SnF and T-SnCl are still ascertained as topological NLSs due to the remaining band inversion, primarily composed of Sn pxy orbitals, while T-SnBr and T-SnI become quantum spin Hall insulators. The phase transition is ascribed to moving up in energy of Sn s orbitals and increasing of SOC strengths. The topology origin in the materials is uniformly rationalized through elementary band representations. The robust and diverse topological states found in the 2D T-SnX monolayers position them as an excellent material platform for development of innovative topological electronics.