Tunable van Hove Singularities and Correlated States in Twisted Trilayer Graphene

Abstract

Understanding and tuning correlated states is of great interest and significance to modern condensed matter physics. The recent discovery of unconventional superconductivity and Mott-like insulating states in magic-angle twisted bilayer graphene (tBLG) presents a unique platform to study correlation phenomena, in which the Coulomb energy dominates over the quenched kinetic energy as a result of hybridized flat bands. Extending this approach to the case of twisted multilayer graphene would allow even higher control over the band structure because of the reduced symmetry of the system. Here, we study electronic transport properties in twisted trilayer graphene (tTLG, bilayer on top of monolayer graphene heterostructure). We observed the formation of van Hove singularities which are highly tunable by twist angle and displacement field and can cause strong correlation effects under optimum conditions, including superconducting states. We provide basic theoretical interpretation of the observed electronic structure.

16 pages, 9 figures

References in corpus (8)

• 2D materials and van der Waals heterostructures
• Superlattice-induced insulating states and valley-protected orbits in twisted bilayer graphene
• Tunable correlation-driven symmetry breaking in twisted double bilayer graphene
• Entropic evidence for a Pomeranchuk effect in magic angle graphene
• Gate-induced interlayer asymmetry in ABA-stacked trilayer graphene
• Transport studies of dual-gated ABC and ABA trilayer graphene: band gap opening and band structure tuning in very large perpendicular electric field
• Electronic Properties of Twisted Trilayer Graphene
• Tunable bandwidths and gaps in twisted double bilayer graphene system on the verge of correlations

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• Emergence of Correlations in Alternating Twist Quadrilayer Graphene
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• Dynamical correlations and order in magic-angle twisted bilayer graphene
• Imaging topological torus lattice from an electron crystal in twisted mono-bilayer graphene
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• Supermoiré low-energy effective theory of twisted trilayer graphene
• TSTG I: Single-Particle and Many-Body Hamiltonians and Hidden Non-local Symmetries of Trilayer Moiré Systems with and without Displacement Field
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• Spin polarized nematic order, quantum valley Hall states, and field tunable topological transitions in twisted multilayer graphene systems
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• Spectroscopic visualization of flat bands in magic-angle twisted monolayer-bilayer graphene: localization-delocalization coexisting electronic states
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• Multilayer graphene with a superlattice potential
• Valley-selective Floquet Chern Flat Bands in Twisted Multilayer Graphene
• Local spectroscopy of a gate-switchable moiré quantum anomalous Hall insulator
• Commensurate and incommensurate double moiré interference in twisted trilayer graphene
• Alternating twisted mutilayer graphene: generic partition rules, double flat bands, and orbital magnetoelectric effect
• Analytical Model for Atomic Relaxation in Twisted Moiré Materials
• Mixed-dimensional moiré systems of graphitic thin films with a twisted interface
• Moire Band Structures of the Double twisted Few Layer Graphene
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• ARPES signatures of few-layer twistronic graphenes
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• Temperature-linear Resistivity in Twisted Double Bilayer Graphene
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• Superconducting Orbital Magnetoelectric Effect and its Evolution across the Superconductivity Normal Metal Phase Transition
• Engineering Three Dimensional Moiré Flat Bands
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• Topological flat bands in a family of multilayer graphene moiré lattices
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• Moiré Flat Bands of Twisted Few-layer Graphite
• Flat bands for electrons in rhombohedral graphene multilayers with a twin boundary
• Nearly flat bands in twisted triple bilayer graphene
• Observation of first-order quantum phase transitions and ferromagnetism in twisted double bilayer graphene
• Doping fingerprints of spin and lattice fluctuations in moiré superlattice systems
• Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene
• Pressure-Driven Moiré Potential Enhancement and Tertiary Gap Opening in Graphene/h-BN Heterostructure
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• Effect of Van Hove singularities on Shiba states in two-dimensional $s$-wave superconductors
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• Interplay of Landau quantization and interminivalley scatterings in a weakly coupled moiré superlattice
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• Independently Tunable Flat Bands and Correlations in a Graphene Double Moiré System
• Short vs. long range exchange interactions in twisted bilayer graphene
• Chern-Textured Exciton Insulators with Valley Spiral Order in Moiré Materials
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• Renormalized Magic Angles in Asymmetric Twisted Graphene Multilayers
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• Hofstadter Butterfly in Graphene