title: Theoretical design of a new family of two-dimensional topological insulators.
abstract: A new family of two-dimensional topological insulator, hydrogenated monolayer Pb2XY (X = Ga/In, Y = Sb/Bi), has been predicted using first-principles density functional theory. The electronic bulk band gap of the proposed systems can be induced in the presence of a spin-orbit coupling effect and its highest value (0.25 eV) was observed in the hydrogenated monolayer Pb2GaBi, which is suitable for practical application. Our simulation study points out that the nanoribbons derived from this new family harbor gapless edge channels. The non-trivial topological nature was further confirmed by calculating the Z2topological invariant. These novel systems provide a new platform for topological phenomena observation and spintronic applications.
authors.affiliation: School of Chemical Engineering and Technology, Sun Yat-sen University, Guangzhou 510275, China. modongch@mail.sysu.edu.cn.
authors.forename: Kai-Xuan
authors.identifier: http://orcid.org/0000-0002-7864-7440
authors.initials: KX
authors.lastname: Chen
authors.affiliation: School of Chemical Engineering and Technology, Sun Yat-sen University, Guangzhou 510275, China. modongch@mail.sysu.edu.cn.
authors.forename: Shu-Shen
authors.initials: SS
authors.lastname: Lyu
authors.affiliation: School of Chemical Engineering and Technology, Sun Yat-sen University, Guangzhou 510275, China. modongch@mail.sysu.edu.cn.
authors.forename: Zhi-Yong
authors.initials: ZY
authors.lastname: Luo
authors.affiliation: School of Chemical Engineering and Technology, Sun Yat-sen University, Guangzhou 510275, China. modongch@mail.sysu.edu.cn.
authors.forename: Yuan-Xiang
authors.initials: YX
authors.lastname: Fu
authors.affiliation: School of Chemical Engineering and Technology, Sun Yat-sen University, Guangzhou 510275, China. modongch@mail.sysu.edu.cn.
authors.forename: Yi
authors.initials: Y
authors.lastname: Heng
authors.affiliation: School of Chemical Engineering and Technology, Sun Yat-sen University, Guangzhou 510275, China. modongch@mail.sysu.edu.cn.
authors.forename: Dong-Chuan
authors.identifier: http://orcid.org/0000-0003-1188-1432
authors.initials: DC
authors.lastname: Mo