2017/02/24 by Xiang‐Long Yu, Xiang-Long Yu, Li Huang +1 · 3 citations
Materials Science · Physics and Astronomy · #Graphene research and applications #Quantum and electron transport phenomena #Topological Materials and Phenomena #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.95.125113
arxiv created 2017/02/24 · openalex publication_date 2017/03/09 · arxiv updated 2017/03/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Plumbene, similar to silicene, has a buckled honeycomb structure with a large band gap (∼ 400 meV). All previous studies have shown that it is a normal insulator. Here, we perform first-principles calculations and employ a sixteen-band tight-binding model with nearest-neighbor and next-nearest-neighbor hopping terms to investigate electronic structures and topological properties of the plumbene monolayer. We find that it can become a topological insulator with a large bulk gap (∼ 200 meV) through electron doping, and the nontrivial state is very robust with respect to external strain. Plumbene can be an ideal candidate for realizing the quantum spin Hall effect at room temperature. By investigating effects of external electric and magnetic fields on electronic structures and transport properties of plumbene, we present two rich phase diagrams with and without electron doping, and propose a theoretical design for a four-state spin-valley filter.