Stability and electronic properties of two-dimensional silicene and germanene on graphene

Abstract

We present first-principles calculations of silicene/graphene and germanene/graphene bilayers. Various supercell models are constructed in the calculations in order to reduce the strain of the lattice-mismatched bilayer systems. Our energetics analysis and electronic structure results suggest that graphene can be used as a substrate to synthesize monolayer silicene and germanene. Multiple phases of single crystalline silicene and germanene with different orientations relative to the substrate could coexist at room temperature. The weak interaction between the overlayer and the substrate preserves the low-buckled structure of silicene and germanene, as well as their linear energy bands. The gap induced by breaking the sublattice symmetry in silicene on graphene can be up to 57 meV.

6 pages, 7 figures

References in corpus (3)

• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• Valley-Polarized Metals and Quantum Anomalous Hall Effect in Silicene
• Hexagonally Warped Dirac Cones and Topological Phase Transition in Silicene Superstructure

Cited by in corpus (29)

• Germanene: a novel two-dimensional Germanium allotrope akin to Graphene and Silicene
• Strain engineering in semiconducting two-dimensional crystals
• Monolayer Topological Insulators: Silicene, Germanene and Stanene
• A systematic study of structural, electronic and optical properties of atomic scale defects in 2D transition metal dichalcogenides MX${}_2$ (M = Mo,W; X = S, Se, Te)
• Tuning the electronic structures of silicene and germanene by biaxial strain and electric field
• First-Principles Study of Hybrid Graphene and MoS${}_2$ Nanocomposites
• Electronic Structures of Hybrid Graphene/Phosphorene Nanocomposite
• Highly Sensitive Gas Sensors Based on Silicene Nanoribbons
• First-principles study of two-dimensional van der Waals heterojunctions
• Phonon Properties, Thermal Expansion, and Thermomechanics of Silicene and Germanene
• Current developments in silicene and germanene
• 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
• Designing substrates for silicene and germanene: First-principles calculations
• Plasmon properties and hybridization effects in Silicene
• Thermal transport across grain boundaries in polycrystalline silicene: a multiscale modeling
• Silicene on Substrates: A Theoretical Perspective
• First-principle calculations of plasmon excitations in graphene,silicene and germanene
• Avoiding critical-point phonon instabilities in two-dimensional materials: The origin of the stripe formation in epitaxial silicene
• Solid argon as a possible substrate for quasi-freestanding silicene
• Growth of Thin Oxidation-Resistive Crystalline Si Nanostructures on Graphene
• Spin- and valley-dependent Goos-Hanchen effect in silicene and gapped graphene structures
• Kagome and honeycomb flat bands in moiré graphene
• Low-temperature linear transport of two-dimensional massive Dirac fermions in silicene: residual conductivity and spin/valley Hall effects
• Valley detection using a graphene gradual pn junction with spin-orbit coupling: an analytical conductance calculation
• Electrically tunable magnetoplasmons in a monolayer of silicene or germanene
• Effects of electron-impurity scattering on density of states in silicene: impurity bands and band-gap narrowing
• Tunable Interfacial Thermal Conductance in Graphene/Germanene van der Waals Heterostructure using an Optimized Interlayer Potential