Realization of free-standing silicene using bilayer graphene

Abstract

The available synthesized silicene-like structures have been only realized on metallic substrates which are very different from the standalone buckled silicene, e.g. the Dirac cone of silicene is destroyed due to lattice distortion and the interaction with the substrate. Using graphene bilayer as a scaffold a novel route is proposed to synthesize silicene with electronic properties decoupled from the substrate. The buckled hexagonal arrangement of silicene between the graphene layers is found to be very similar to the theoretically predicted standalone buckled silicene which is only very weakly van der Waals coupled to the graphene layers with a graphite-like interlayer distance of 3.42\,Åand without only lattice distortion. We found that these stacked layers are stable well above room temperature.

arXiv comment12 pages, 3 figures

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• Electronic Structures of Hybrid Graphene/Phosphorene Nanocomposite
• First-principles study of two-dimensional van der Waals heterojunctions
• Spin and valley polarization of plasmons in silicene due to external fields
• Spin- and valley-dependent transport through arrays of ferromagnetic silicene junctions
• van der Waals Heterostructures of Germanene, Stanene and Silicene with Hexagonal Boron Nitride and Their Topological Domain Walls
• All-Metallic Vertical Transistors Based on Stacked Dirac Materials
• An optimized interatomic potential for silicon and its application to thermal stability of silicene
• Stabilized silicene within bilayer graphene: A proposal based on molecular dynamics and density-functional tight-binding calculations
• On the Optical Properties of Excitons in Buckled 2D Materials in an External Electric Field
• Silicene on Substrates: A Theoretical Perspective
• Vacancy tuned thermoelectric properties and high spin filtering performance in graphene/silicene heterostructures
• Scanning tunneling microscopy and Raman evidences of silicene nanosheets intercalated into graphite surface at room temperature
• Predictive coupled-cluster isomer orderings for some Si${}_n$C${}_m$ ($m,n\le 12$) clusters; A pragmatic comparison between DFT and complete basis limit coupled-cluster benchmarks
• Valley polarization in graphene-silicene-graphene heterojunction
• Electronic properties of silicene in BN/silicene van der Waals heterostructures
• Power loss of hot Dirac fermions in silicene and its near equivalence with graphene
• Protected edge states in silicene antidots and dots in magnetic field
• Electrically tunable magnetoplasmons in a monolayer of silicene or germanene