title: Quantum spin Hall insulator in halogenated arsenene films with sizable energy gaps.
abstract: Based on first-principles calculations, the electronic and topological properties of halogenated (F-, Cl-, Br- and I-) arsenene are investigated in detail. It is found that the halogenated arsenene sheets show Dirac type characteristic in the absence of spin-orbital coupling (SOC), whereas energy gap will be induced by SOC with the values ranging from 0.194 eV for F-arsenene to 0.255 eV for I-arsenene. Noticeably, these four newly proposed two-dimensional (2D) systems are verified to be quantum spin Hall (QSH) insulators by calculating the edge states with obvious linear cross inside bulk energy gap. It should be pointed out that the large energy gap in these 2D materials consisted of commonly used element is quite promising for practical applications of QSH insulators at room temperature.
authors.affiliation: Institute of Condensed Matter Physics, Linyi University, Shandong 276000, China.|School of Physics, Shandong University, Shandong, China.
authors.forename: Dongchao
authors.initials: D
authors.lastname: Wang
authors.affiliation: Institute of Condensed Matter Physics, Linyi University, Shandong 276000, China.|School of Physics, Shandong University, Shandong, China.
authors.forename: Li
authors.initials: L
authors.lastname: Chen
authors.affiliation: Institute of Condensed Matter Physics, Linyi University, Shandong 276000, China.
authors.forename: Changmin
authors.initials: C
authors.lastname: Shi
authors.affiliation: Institute of Condensed Matter Physics, Linyi University, Shandong 276000, China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Wang
authors.affiliation: Institute of Condensed Matter Physics, Linyi University, Shandong 276000, China.
authors.forename: Guangliang
authors.initials: G
authors.lastname: Cui
authors.affiliation: Institute of Condensed Matter Physics, Linyi University, Shandong 276000, China.
authors.forename: Pinhua
authors.initials: P
authors.lastname: Zhang
authors.affiliation: Institute of Condensed Matter Physics, Linyi University, Shandong 276000, China.
authors.forename: Yeqing
authors.initials: Y
authors.lastname: Chen