title: Topological states modulation of Bi and Sb thin films by atomic adsorption.
abstract: Based on first-principles calculations, we systematically investigated the topological surface states of Bi and Sb thin films of 1-5 bilayers in (111) orientation without and with H(F) adsorption, respectively. We find that compared with clean Bi and Sb films, a huge band gap advantageous to observe the quantum spin Hall effect can be opened in chemically decorated bilayer Bi and Sb films, and the quantum phase transition from trivial (non-trivial) to non-trivial (trivial) phase is induced for a three bilayer Bi film and single (four) bilayer Sb film. Surface adsorption is an effective tool to manipulate the geometry, electronic structures and topological properties of film materials.
authors.affiliation: School of Physics, Shandong University, Shandong 250100, China. chenli@lyu.edu.cn.
authors.forename: Dongchao
authors.initials: D
authors.lastname: Wang
authors.forename: Li
authors.initials: L
authors.lastname: Chen
authors.forename: Hongmei
authors.initials: H
authors.lastname: Liu
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Wang
authors.forename: Guangliang
authors.initials: G
authors.lastname: Cui
authors.forename: Pinhua
authors.initials: P
authors.lastname: Zhang
authors.forename: Dapeng
authors.initials: D
authors.lastname: Zhao
authors.forename: Shuaihua
authors.initials: S
authors.lastname: Ji