title: Many-body effects in silicene, silicane, germanene and germanane.
abstract: Silicene, which is the silicon equivalent of carbon-based graphene and shares some of the unique properties with graphene, has been attracting more and more attention since its synthesis and represents a breakthrough in current silicon-based technology. In this work, many-body effects in silicene, silicane, germanene and germanane have been demonstrated based on the Green's function perturbation theory, i.e., GW + Bethe-Salpeter equation. Due to confinement, many-body effects play a pivotal role in quasi-particle excitations and optical absorption spectra, which leads to excitonic resonance (π→π* excitation) in silicene and germanene, and strongly bound excitons in silicane and germanane with considerable binding energies.
authors: School of Physics, State Key Laboratory of Crystal Material, Shandong University, Jinan 250100, People's Republic of China.
authors: Wei
authors: W
authors: Wei
authors: Ying
authors: Y
authors: Dai
authors: Baibiao
authors: B
authors: Huang
authors: Timo
authors: T
authors: Jacob