Emergence of Superlattice Dirac Points in Graphene on Hexagonal Boron Nitride

Abstract

The Schrödinger equation dictates that the propagation of nearly free electrons through a weak periodic potential results in the opening of band gaps near points of the reciprocal lattice known as Brillouin zone boundaries. However, in the case of massless Dirac fermions, it has been predicted that the chirality of the charge carriers prevents the opening of a band gap and instead new Dirac points appear in the electronic structure of the material. Graphene on hexagonal boron nitride (hBN) exhibits a rotation dependent Moiré pattern. In this letter, we show experimentally and theoretically that this Moiré pattern acts as a weak periodic potential and thereby leads to the emergence of a new set of Dirac points at an energy determined by its wavelength. The new massless Dirac fermions generated at these superlattice Dirac points are characterized by a significantly reduced Fermi velocity. The local density of states near these Dirac cones exhibits hexagonal modulations indicating an anisotropic Fermi velocity.

arXiv comment16 pages, 6 figures

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• Impact of the angular alignment on the crystal field and intrinsic doping of bilayer graphene/BN heterostructures
• Evidence of electron-electron interactions around Van Hove singularities of a graphene Moiré superlattice
• Edge dependece of nonlocal transport in gapped bilayer graphene
• Generation of Multiple Dirac Cones in Graphene under Double-periodic and Quasiperiodic Potentials
• Tunable Dirac points and zero-energy modes in periodic curved graphene superlattices
• Field-induced insulating states in a graphene superlattice
• Layer-dependent transport properties in the Moiré of strained homobilayer transition metal dichalcogenides
• Generation and control of non-local chiral currents in graphene superlattices by orbital Hall effect
• Modification of the magnetic and electronic properties of the graphene-Ni(111) interface via halogens intercalation
• Berry curvature induced valley Hall effect in non-encapsulated hBN/Bilayer graphene heterostructure aligned with near-zero twist angle
• Trigonal Quasicrystalline States in $30^{\circ }$ Rotated Double Moiré Superlattices
• Electric field tunable bands in doubly aligned bilayer graphene hBN moire superlattice
• Topologically protected one-dimensional electronic states in group IV two-dimensional Dirac materials
• Hexagonal boron nitride/bilayer graphene moiré superlattices in the Dirac-material family: energy-band engineering and carrier doping by dual gating
• Strong Correlations and Superconductivity in the Supermoiré Lattice
• The Tip-Induced Twisted Bilayer Graphene Superlattice on HOPG: Capillary Attraction Effect
• Ferroelectric hysteresis in singly aligned graphene-hBN moiré superlattices
• Dynamic Moiré-like pattern in non-Hermitian Wannier-Stark ladder system
• Disorder correction to the minimal conductance of a nodal-point semimetal
• Magnetic ordering tendencies in hexagonal boron nitride-bilayer graphene moiré structures
• Exploring Quantum Hall Physics at Ultra-Low Temperatures and at High Pressures
• Emergent exotic chirality dependent dielectricity in magnetic twisted bilayer system
• Moiré-driven equilibrium of perturbations in moiré systems
• Paramagnetic singularities of the orbital magnetism in graphene with a moiré potential
• A survey of interlayer interaction models for graphene and other 2D materials
• Emergent electronic insulating states in a one-dimensional moiré superlattice
• Spectroscopic evidence for electron correlations in the interface-modulated epitaxial bilayer graphene
• Multiple Hot-Carrier Collection in Photo-Excited Graphene Moire Superlattices
• Direct Measurement of the Magnitude of van der Waals interaction of Single and Multilayer Graphene
• Coexisting Massive and Massless Dirac Fermions in Moire'-Reconstructed Bilayer Graphene
• Hofstadter Butterfly in Graphene
• Localized Interlayer Excitons in MoSe2-WSe2 Heterostructures without a Moiré Potential
• Composite fermions and parton wavefunctions in twisted graphene on hexagonal boron nitride
• Scalable and deterministic construction of moiré superlattice in 2D materials using stressor films
• Unconventional satellite resistance peaks in moiré superlattice of h-BN/ AB-stacked tetralayer-graphene heterostructure
• Untangling 3D atomic reconstruction in twisted bilayer 2D crystals via dark field transmission electron microscopy
• Magnetic-field-assisted electron confinement and valley splitting in strained graphene