title: Electronic structure and optical properties of graphene/stanene heterobilayer.
abstract: The structural, electronic and optical properties of the graphene hybrid with stanene, the tin counterpart of graphene, are investigated by means of density functional calculation with the observation of band gap opening and enhanced visible light response. The lattice mismatch between graphene and stanene is taken into consideration and several stacking methods for model construction are proposed to study the possible effects. The Dirac feature can be observed in this bilayer system with relatively stronger interlayer interaction than weak van der Waals forces, which is ascribed to the unsaturated p orbital of stanene. Despite the mutual semi-metal nature of graphene and stanene, it is significant to note a band gap opening and the electrical neutrality of the bilayer. The combination of high carrier mobility of graphene and the excellent spin Hall effect of stanene is expected to coexist in the bilayer structure. In addition, we found that the stanene monolayer has a relatively lower work function than graphene and more importantly, it exhibits more pronounced optical absorption than graphene. The results indicate that a graphene/stanene heterobilayer will facilitate the performance of stanene related spintronic devices and is therefore a good candidate for photoelectronic devices.
authors.affiliation: Faculty of Electromechanical Engineering, Guilin University of Electronic Technology, 541004 Guilin, China. xianpingchen1979@126.com.
authors.forename: Xianping
authors.initials: X
authors.lastname: Chen
authors.forename: Ruishen
authors.initials: R
authors.lastname: Meng
authors.forename: Junke
authors.initials: J
authors.lastname: Jiang
authors.forename: Qiuhua
authors.initials: Q
authors.lastname: Liang
authors.forename: Qun
authors.initials: Q
authors.lastname: Yang
authors.forename: Chunjian
authors.initials: C
authors.lastname: Tan
authors.forename: Xiang
authors.initials: X
authors.lastname: Sun
authors.forename: Shengli
authors.initials: S
authors.lastname: Zhang
authors.forename: Tianling
authors.initials: T
authors.lastname: Ren