EurekAlert May 23, 2019
Plumbene is a lead-based 2D honeycomb material that has the largest spin-orbit interaction, due to lead’s orbital electron structure and therefore the largest energy band gap, potentially making it a robust 2D topological insulator in which the Quantum Spin Hall Effect might occur even above room temperature. An international team of researchers (Japan, France) created plumbene by annealing an ultrathin lead (Pb) film on palladium Pd(111). The resulting surface material has the signature honeycomb structure of a 2D monolayer. Beneath the plumbene, a palladium-lead (Pd-Pb) alloy thin film forms with a bubble structure. Atomic‐scale STM images of this Pb sheet show a planar honeycomb structure with a unit cell ranging from 0.48 to 0.49 nm corresponding to that of the standalone 2D topological insulator plumbene…read more. TECHNICAL ARTICLE
Plumbene is realized by annealing an ultrathin lead (Pb) film on palladium Pd(111). The resulting surface material has the signature honeycomb structure of a 2D monolayer. Credit: Junji Yuhara