From a normal insulator to a topological insulator in plumbene

Abstract

Plumbene, similar to silicene, has a buckled honeycomb structure with a large band gap ($\sim 400$ 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 ($\sim 200$ 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.

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• Origin of topologically trivial states and topological phase transitions in low-buckled plumbene
• Electronic Structure and Band Gap Engineering of Two-Dimensional Octagon-Nitrogene
• Topological Phase Transitions and Quantum Hall Effect in the Graphene Family
• Large-Area Intercalated 2D-Pb/Graphene Heterostructure as a Platform for Generating Spin-Orbit Torque
• Phonon dispersions and electronic structures of two-dimensional IV-V compounds
• Observation of type-III corner states induced by long-range interactions
• Stabilities and novel electronic structures of three carbon nitride bilayers
• Probing topological phase transitions via quantum reflection in the graphene family materials
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• Superconductivity and topological behavior in gallenene
• Phonon and electronic properties of semiconducting silicon nitride bilayers