Substrate-induced band gap opening in epitaxial graphene

Abstract

Graphene has shown great application potentials as the host material for next generation electronic devices. However, despite its intriguing properties, one of the biggest hurdles for graphene to be useful as an electronic material is its lacking of an energy gap in the electronic spectra. This, for example, prevents the use of graphene in making transistors. Although several proposals have been made to open a gap in graphene's electronic spectra, they all require complex engineering of the graphene layer. Here we show that when graphene is epitaxially grown on the SiC substrate, a gap of ~ 0.26 is produced. This gap decreases as the sample thickness increases and eventually approaches zero when the number of layers exceeds four. We propose that the origin of this gap is the breaking of sublattice symmetry owing to the graphene-substrate interaction. We believe our results highlight a promising direction for band gap engineering of graphene.

10 pages, 4 figures; updated references

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• First-principles calculations of electrical conductivities of edge-modified graphene nanoribbons: strain effect
• Effect of topological defects and Coulomb charge on the low energy quantum dynamics of gapped graphene
• Unveiling quasiparticle dynamics of topological insulators through Bayesian modelling
• Quantum Spin Hall Effect and Su-Schrieffer-Heeger Model Implementation in Novel C3N-based Dumbbell Morphologies
• Effectuating tunable valley selection via multi-terminal monolayer graphene devices
• Relativistic Double Barrier Problem with Three Sub-Barrier Transmission Resonance Regions
• Diffusion on edges of insulating graphene with intravalley and intervalley scattering
• Experimental evidence of plasmarons and effective fine structure constant in electron-doped graphene/h-BN heterostructure
• Transmission across a bilayer graphene region
• Effective Medium Model for Graphene Superlattices with Electrostatic and Magnetic Vector Potentials
• An investigation on electronic and magnetic properties of Cr substituted MoS${}_2$ monolayer and multilayers-Hybrid functional calculations
• Small scale rotational disorder observed in epitaxial graphene on SiC(0001)
• Transient Charge and Energy Balance in Graphene Induced by Ultrafast Photoexcitation
• Hall viscosity and nonlocal conductivity of "gapped graphene"
• Gap opening in the zeroth Landau level in gapped graphene: Pseudo-Zeeman splitting in an angular magnetic field
• Robust wavefront dislocations of Friedel oscillations in gapped graphene
• Ising instability of a Holstein phonon mode in graphene
• Coulomb effects in the absorbance spectra of two-dimensional Dirac materials
• Momentum alignment and the optical valley Hall effect in low-dimensional Dirac materials
• Topological end states and Zak phase of rectangular armchair ribbon
• Spectral Signatures of Non-Trivial Topology in a Superconducting Circuit
• Dirac equation in curved spacetime: the role of local Fermi velocity
• Light-amplified Landau-Zener conductivity in gapped graphene monolayers: a simulacrum of photo-catalyzed vacuum instability
• Edge state in AB-stacked bilayer graphene and its correspondence with SSH ladder
• Topologically protected wave packets and quantum rings in silicene
• Floquet states of Valley-Polarized Metal with One-way Spin or Charge Transport in Zigzag Nanoribbons
• Study on the high spectral intensity at the Dirac energy of single-layer graphene on an SiC substrate
• Designing Quantum Spin-Orbital Liquids in Artificial Mott Insulators
• TE resonances in graphene-dielectric structures
• Band gap engineering in finite elongated graphene nanoribbon heterojunctions: Tight-binding model
• Electron Confinement Induced by Diluted Hydrogen-like Ad-atoms in Graphene Ribbons
• Spotting 2-D Atomic Layers on Aluminum Nitride Thin Films
• Electric control of tunneling energy in graphene double dots
• Electronic Structures and Their Landau Quantizations in Twisted Graphene Bilayer and Trilayer
• Dirac Cones and Room Temperature Polariton Lasing Evidenced in an Organic Honeycomb Lattice
• Anomalous Valley Magnetic Moment of Graphene
• The role of the Rashba coupling in spin current of monolayer gapped graphene
• Gap modification of atomically thin boron nitride by phonon mediated interactions
• Zigzag graphene nanoribbons without inversion symmetry
• NMR parameters in gapped graphene systems
• Controlling of the Dirac band states of Pb-deposited graphene by using work function difference
• Exciton swapping in a twisted graphene bilayer as a solid-state realization of a two-brane model
• Nonlinear Properties of Gated Graphene in a Strong Electromagnetic Field
• Femtosecond currents in transition metal dichalcogenides monolayers
• Light-induced large and tunable valley-selective Hall effect in a centrosymmetric system
• Tuning the electronic structure and magnetic coupling in armchair B${}_2$S nanoribbons using strain and staggered sublattice potential
• Nearly pure spin-valley sideband tunneling in silicene: effect of interplay of time periodic potential barrier and spin-valley-dependent Dirac mass
• Polaritonic Contribution to the Casimir Energy between two Graphene Layers
• A topological Dirac insulator in a quantum spin Hall phase (experimental realization of a 3D Topological Insulator)
• Collapse of the vacuum in hexagonal graphene quantum dots: a comparative study between the tight-binding and the mean-field Hubbard models
• Charge Transport Mechanism in Chevron--Graphene Nanoribbons
• Bandgap evolution in nanographene assemblies
• Substrate effects on transport properties of a biased AA-stacked bilayer graphene
• h-BN layer induced chiral decomposition in the electronic properties of multilayer graphene
• Magnetoresistance in Noncentrosymmetric Two-dimensional Systems
• Transport through vertical graphene contacts under intense laser fields
• Anisotropic optical conductivity and electron-hole asymmetry in doped monolayer graphene in the presence of the Rashba coupling
• Transport, Magnetic and Vibrational Properties of Chemically Exfoliated Few Layer Graphene
• Effect of weak disorder on delocalization properties of gapped graphene superlattices
• Ballistic transport properties in pristine-doped-pristine graphene junctions
• Temperature-dependent Drude transport in a two-dimensional electron gas
• Flat bands without twists: periodic holey graphene
• Valley selecting current partition at zero-line mode of quantum anomalous Hall topologies
• Valley transport driven by dynamic lattice distortion
• Magnetizations and de Haas-van Alphen oscillations in massive Dirac fermions
• Conduction band population in graphene in ultrashort strong laser field: case of massive Dirac particles
• Uniqueness of the Fock quantization of Dirac fields in 2+1 dimensions
• The mutual rectification effect of electric currents induced by electromagnetic waves in materials with non-additive energy spectrum: the quantum kinetic equation approach
• Tuned gap in graphene through laser barrier
• Disorder induced field effect transistor in bilayer and trilayer graphene
• Multiphoton absorption and Rabi oscillations in armchair graphene nanoribbons
• Collective excitations and the nature of Mott transition in undoped gapped graphene
• Creation and control of valley currents in graphene by few cycle light pulses
• Electronic transport properties and quantum localization effects monitored by selective functionalization in Bernal bilayer graphene
• Graphene/g-C2N bilayer:gap opening, enhanced visible light response and electrical field tuning band structure
• Electronic structure and transport in materials with flat bands: 2D materials and quasicrystals
• Specific features of electric charge screening in few-layer graphene films
• Electronic structure and transport in graphene: quasi-relativistic Dirac--Hartry--Fock self-consistent field approximation
• Critical Charge in Gapped Graphene: the role of the screening of the interaction potential by $\sigma$-orbitals
• Ultrafast strong-field absorption in gapped graphene
• Tuning Gap in Corrugated Graphene with Spin Dependence
• Hofstadter-like spectrum and Magnetization of Artificial Graphene constructed with cylindrical and elliptical quantum dots
• Effects of strain-tunable valleys on charge transport in bismuth
• Factorization of Dirac Equation and Graphene Quantum Dot
• Pseudo spin-orbit coupling of Dirac particles in graphene spintronics
• Unusual spin-triplet superconductivity in monolayer graphene
• Geometry-induced wavefunction collapse
• Magnetic field controlled vacuum charge in graphene quantum dots with a mass gap
• Aharonov-Bohm-Coulomb Problem in Graphene Ring
• Dielectric properties of graphene on transition metal dichalcogenide substrate
• Energy spectra of graphene quantum dots induced between Landau levels
• Electronic and Spin-Orbit Properties of hBN Encapsulated Bilayer Graphene
• First-order effect of electron-electron interactions on the anomalous Hall conductivity of massive Dirac fermions
• Substrate-induced half-metallic property in epitaxial silicene
• A thermodynamic probe of the topological phase transition in epitaxial graphene based Floquet topological insulator
• Precise quantum-geometric electronic properties from first principles
• Quantization and quantum oscillations of the sublattice charge order in Dirac insulators
• Topological Interface States and Nonlinear Thermoelectric Performance in Armchair Graphene Nanoribbon Heterostructures
• Controlling the Interferometers of Zero-Line Modes in Graphene by Pseudomagnetic field
• A universal exponential factor in the dimensional crossover from graphene to graphite
• Gap states and edge properties of rectangular graphene quantum dot in staggered potential
• Gapped energy spectra around the Dirac node at the surface of a 3D topological insulator in the presence of the time-reversal symmetry
• Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene
• Coulomb excitations of monolayer germanene
• Transmissions in gapped graphene exposed to tilting and oscillating barriers
• Magneto-electronic properties of twisted bilayer graphene system
• Self-doping effects in epitaxially grown graphene
• Configuration- and concentration-dependent electronic properties of hydrogenated graphene
• Tunneling in rippled graphene superlattice with spin dependence and a mass term
• Geometric, magnetic and electronic properties of folded graphene nanoribbons
• Electric charge and potential distribution in twisted multilayer graphene
• Tuning Bandgap and Energy Stability of Organic-Inorganic Halide Perovskites through Surface Engineering
• Quantum transport of pseudospin-polarized Dirac fermions in gapped graphene nanostructures
• Klein tunneling through triple barrier in AB bilayer graphene
• Disorder and Interactions in Graphene and other Quantum Systems
• Clar Sextet Analysis of Triangular, Rectangular and Honeycomb Graphene Antidot Lattices
• Three-Fold Diffraction Symmetry in Epitaxial Graphene and the SiC Substrate
• Graphite intercalation compound KC${}_8$ revisited: a key to graphene
• Raman spectroscopy and imaging of graphene
• The transmission spectra of the graphene-based Fibonacci superlattice
• Effects of Interfacial Distance and Electric Field on Graphene-Silicene Hybrid Structures
• Spectroscopic evidence for electron correlations in the interface-modulated epitaxial bilayer graphene
• Hydrogen-mediated CVD epitaxy of Graphene on SiC: growth mechanism and atomic configuration
• Coherent-scatterer enhancement and Klein-tunneling suppression by potential barriers in gapped graphene with chirality-time-reversal symmetry