Minibands in twisted bilayer graphene probed by magnetic focusing
arXiv:1911.02827 · doi:10.1126/sciadv.aay7838
Abstract
Magnetic fields force ballistic electrons injected from a narrow contact to move along skipping orbits and form caustics. This leads to pronounced resistance peaks at nearby voltage probes as electrons are effectively focused inside them, a phenomenon known as magnetic focusing. This can be used not only for the demonstration of ballistic transport but also to study the electronic structure of metals. Here we use magnetic focusing to probe narrow bands in graphene bilayers twisted at 2 degrees. Their minibands are found to support long-range ballistic transport limited at low temperatures by intrinsic electron-electron scattering. A voltage bias between the layers causes strong valley splitting and allows selective focusing for different valleys, which is of interest for using this degree of freedom in frequently-discussed valleytronics.
References in corpus (26)
- Magic-angle graphene superlattices: a new platform for unconventional superconductivity
- Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
- Moire bands in twisted double-layer graphene
- Tuning superconductivity in twisted bilayer graphene
- Hofstadter's butterfly in moire superlattices: A fractal quantum Hall effect
- Moiré Excitons in Van der Waals Heterostructures
- Cloning of Dirac fermions in graphene superlattices
- Observation of Van Hove singularities in twisted graphene layers
- Signatures of moiré-trapped valley excitons in MoSe/WSe heterobilayers
- Emergence of Superlattice Dirac Points in Graphene on Hexagonal Boron Nitride
- Observation of Moiré Excitons in WSe2/WS2 Heterostructure Superlattices
- Flat Bands in Slightly Twisted Bilayer Graphene
- Resonantly hybridised excitons in moiré superlattices in van der Waals heterostructures
- Acoustic phonon scattering limited carrier mobility in 2D extrinsic graphene
- Tunable Moiré Bands and Strong Correlations in Small-Twist-Angle Bilayer Graphene
- Electronic Properties of Graphene Encapsulated with Different Two-Dimensional Atomic Crystals
- Superlattice-induced insulating states and valley-protected orbits in twisted bilayer graphene
- Generic Miniband Structure of Graphene on a Hexagonal Substrate
- Electrically tunable transverse magnetic focusing in graphene
- Ballistic miniband conduction in a graphene superlattice
- High-temperature quantum oscillations caused by recurring Bloch states in graphene superlattices
- Quantum Hall Effect, Screening and Layer-Polarized Insulating States in Twisted Bilayer Graphene
- Transport through a network of topological states in twisted bilayer graphene
- Tunable Graphene System with Two Decoupled Monolayers
- High-order fractal states in graphene superlattices
- Quantum Hall Effect in Bernal Stacked and Twisted Bilayer Graphene Grown on Cu by Chemical Vapor Deposition
Cited by in corpus (21)
- Mirror Symmetry Breaking and Lateral Stacking Shifts in Twisted Trilayer Graphene
- Out-of-plane dielectric susceptibility of graphene in twistronic and Bernal bilayers
- Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe
- Combined minivalley and layer control in twisted double bilayer graphene
- Strong interminivalley scattering in twisted bilayer graphene revealed by high-temperature magnetooscillations
- Moiré superlattice effects and band structure evolution in near-30-degree twisted bilayer graphene
- Precision measurement of electron-electron scattering in GaAs/AlGaAs using transverse magnetic focusing
- Synchronizing Bloch-oscillating free carriers in moiré flat bands
- Cloning of Zero Modes in One-Dimensional Graphene Superlattices
- Gate-tunable regular and chaotic electron dynamics in ballistic bilayer graphene cavities
- Probing miniband structure and Hofstadter butterfly in gated graphene superlattices via magnetotransport
- Specular electron focusing between gate-defined quantum point contacts in bilayer graphene
- Interlayer electron-hole friction in tunable twisted bilayer graphene semimetal
- Temperature Dependence of Electron Viscosity in Superballistic GaAs Point Contacts
- Valley splitter and transverse valley focusing in twisted bilayer graphene
- Moiré-Induced Transport in CVD-Based Small-Angle Twisted Bilayer Graphene
- Manipulating electron waves in graphene using carbon nanotube gating
- Coulomb drag in graphene/hBN/graphene moiré heterostructures
- Quantum Hall Effect at 0.002T
- Slip electron flow in GaAs microscale constrictions
- Probing the Anisotropic Fermi Surface in Tetralayer Graphene via Transverse Magnetic Focusing