title: Single and multiple doping effects on charge transport in zigzag silicene nanoribbons.
abstract: A non-equilibrium Green's function technique combined with density functional theory is used to study the spin-dependent electronic band structure and transport properties of zigzag silicene nanoribbons (ZSiNRs) doped with aluminum (Al) or phosphorus (P) atoms. The presence of a single Al or P atom induces quasibound states in ZSiNRs that can be observed as new dips in the electron conductance. The Al atom acts as an acceptor whereas the P atom acts as a donor if it is placed at the center of the ribbon. This behavior is reversed if the dopant is placed on the edges. Accordingly, an acceptor-donor transition is observed in ZSiNRs upon changing the dopant's position. Similar results are obtained if two silicon atoms are replaced by two impurities (Al or P atoms) but the conductance is generally modified due to the impurity-impurity interaction. If the doping breaks the twofold rotational symmetry about the central line, the transport becomes spin-dependent.
authors.affiliation: College of Physics, Optoelectronics and Energy, Soochow University, 1 Shizi Street, Suzhou 215006 (China).
authors.forename: Jie
authors.initials: J
authors.lastname: Chen
authors.forename: Xue-Feng
authors.initials: XF
authors.lastname: Wang
authors.forename: Panagiotis
authors.initials: P
authors.lastname: Vasilopoulos
authors.forename: An-Bang
authors.initials: AB
authors.lastname: Chen
authors.forename: Jian-Chun
authors.initials: JC
authors.lastname: Wu
keywords: conductance; doping; electronic structure; nanoribbons; silicene